Tree View in ASP.NET MVC5 - asp.net-mvc-5

I need to create a tree view in asp.net mvc5 framework for the recursive outputs.
This is my model class
public class ProcSearchModel
{
/// <summary>
///
/// </summary>
public string TableName { get; set; }
/// <summary>
///
/// </summary>
public string DirectoryPath { get; set; }
/// <summary>
///
/// </summary>
public List<string> ProceduresName { get; set; }
// public List<ProcSearchModel> =
}
That stores the list of result in ProceduresName list.
Now for each Procedure name in the list there is another list of names in it. Which I need to populate as tree view..
Presently this is my controller function:
public ActionResult SearchProcedure(ProcSearchModel procSearchModel)
{
List<string> lstString = new List<string>();
//if (procSearchModel != null)
//{
try
{
var txtFiles = Directory.EnumerateFiles(procSearchModel.DirectoryPath, "*.sql", SearchOption.AllDirectories);
// pattern to capture the Stored procedue name
// string cpattern = #"(CREATE PROCEDURE|ALTER PROCEDURE)\s*(?<proc_name>(\w|_|\[|\]|\.)*)(.|\n)*" + procSearchModel.TableName;
string cPattern = #"(CREATE PROCEDURE|ALTER PROCEDURE)\s*(?<proc_name>(\w|_|\[|\]|\.)*)";
string tPattern = procSearchModel.TableName;
foreach (string currentFile in txtFiles)
{
string content = System.IO.File.ReadAllText(currentFile);
if(Regex.IsMatch(content,tPattern,RegexOptions.IgnoreCase) && Regex.IsMatch(content,cPattern,RegexOptions.IgnoreCase))
{
Match match = Regex.Match(content, cPattern, RegexOptions.IgnoreCase);
lstString.Add(match.Groups["proc_name"].Value);
}
}
procSearchModel.ProceduresName = lstString;
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
//}
return View(procSearchModel);
}
Now plz help me how to populate the tree view by usnig nested list with jstree plugin

Create a recursive node structure of the nodes (or objects) as you need in the hierarchy and link them as in a tree. Then pass that object in a tree
class dummyObject{
int num;
String data;
List<dummyObject> d = new List<dummyObject>();
}
Use this type of class object to create hierarchy structure and then pass them into jstree (http://www.jstree.com/) plugin call..... Rest will be done the plugin.

Related

How do I communicate between two sibling Blazor components?

I have a Blazor page with two components. One component has a button which generates a random number when clicked. The other component has a text area which should display the generated random number.
<h1>Parent Page</h1>
<ProvideNumberComponent />
<DisplayNumberComponent />
#code {
}
<h3>Provides Number</h3>
<button class="btn btn-primary" #onclick="CalculateNumber">Provide Number</button>
#code {
private void CalculateNumber(MouseEventArgs e)
{
Random rnd = new Random();
Int32 nextNumber = rnd.Next();
}
}
<h3>Displays number</h3>
<textarea cols="9" rows="1" readonly style="font-family:monospace;" />
#code {
}
What is the cleanest way to get the number from the calculate sibling component to appear in the display sibling component?
A problem with my code is that the Random object is instantiated on every button click, instead of once on initialization. Is this best addressed by placing the Random object in a singleton service class, and injecting that into the calculate component?
The best solution, to my mind, is to create a service which implements the state pattern and the notifier pattern. The following code describes how communication between two sibling can be done through an intermediary
NotifierService.cs
public class NotifierService
{
public NotifierService()
{
}
int rnd;
public int RandomNumber
{
get => rnd;
set
{
if (rnd != value)
{
rnd= value;
if (Notify != null)
{
Notify?.Invoke();
}
}
}
}
public event Func<Task> Notify;
}
Add this: services.AddScoped<NotifierService>();
ProvideNumberComponent.razor
#inject NotifierService Notifier
#implements IDisposable
<h3>Provides Number</h3>
<button class="btn btn-primary" #onclick="CalculateNumber">Provide
Number</button>
#code
{
private void CalculateNumber(MouseEventArgs e)
{
Random rnd = new Random();
Int32 nextNumber = rnd.Next();
Notifier.RandomNumber = nextNumber;
}
public async Task OnNotify()
{
await InvokeAsync(() =>
{
StateHasChanged();
});
}
protected override void OnInitialized()
{
Notifier.Notify += OnNotify;
}
public void Dispose()
{
Notifier.Notify -= OnNotify;
}
}
DisplayNumberComponent.cs
#inject NotifierService Notifier
#implements IDisposable
<hr />
<h3>Displays number</h3>
<textarea cols="9" rows="1" readonly style="font-family:monospace;">
#Notifier.RandomNumber
</textarea>
#code {
public async Task OnNotify()
{
await InvokeAsync(() =>
{
StateHasChanged();
});
}
protected override void OnInitialized()
{
Notifier.Notify += OnNotify;
}
public void Dispose()
{
Notifier.Notify -= OnNotify;
}
}
Of course you can inject and use the service in multiple components, as well as adding more features that the service can provide.
Implementing communication by means of event handlers may be problematic, unless it is between a parent and its child...
Hope this works...
Indeed there are many ways to accomplish your goal, I just want to show you the way I like more:
Parent Component:
<EditForm Model="Message">
<PageOne #bind-Send="Message.Text"/>
<PageTwo #bind-Receive="Message.Text"/>
</EditForm>
#code{
public Content Message { get; set; }=new Index.Content();
public class Content
{
public string Text { get; set; } = "Hello world";
}
}
PageOne component - the one who send the value:
<button #onclick="#GetGuid">Change value</button>
#code{
[Parameter] public string Send { get; set; }
[Parameter] public EventCallback<string> SendChanged { get; set; }
async void GetGuid()
{
await SendChanged.InvokeAsync(Guid.NewGuid().ToString());
}
}
PageTwo the component which will receive the data
<h1>#Receive</h1>
#code{
[Parameter] public string Receive { get; set; }
[Parameter] public EventCallback<string> ReceiveChanged { get; set; }
}
Explanations:
Usually when we need to communicate, we need a third party service, and in this case I used the EditForm component, which can store a Model and the properties of this model can be shared by all child components.
I also made a custom component, with less functionality, and I named PhoneBox (to be used instead EditForm), just to be obvious the role :)
PhoneBox - third party communication service :)
<CascadingValue Value="EditContext">
#ChildContent(EditContext)
</CascadingValue>
#code {
[Parameter] public object Model { get; set; }
[Parameter]public EditContext EditContext { get; set; }
[Parameter] public RenderFragment<EditContext> ChildContent { get; set; }
protected override void OnInitialized()
{
EditContext = new EditContext(Model);
}
}
I like more this approach because look's more "blazor way" :)
Look how nice is "blazor way"
<PhoneBox Model="Message">
<PageOne #bind-Send="Message.Text"/>
<PageTwo #bind-Receive="Message.Text"/>
</PhoneBox>
You can see a working example Working Example
I think interfaces are the best way to do this.
This is from my Nuget package, DataJugger.Blazor.Components
Interface IBlazorComponent:
#region using statements
using System.Collections.Generic;
#endregion
namespace DataJuggler.Blazor.Components.Interfaces
{
#region interface IBlazorComponent
/// <summary>
/// This interface allows communication between a blazor componetn and a parent component or page.
/// </summary>
public interface IBlazorComponent
{
#region Methods
#region ReceiveData(Message message)
/// <summary>
/// This method is used to send data from a child component to the parent component or page.
/// </summary>
/// <param name="data"></param>
void ReceiveData(Message message);
#endregion
#endregion
#region Properties
#region Name
/// <summary>
/// This property gets or sets the Name.
/// </summary>
public string Name { get; set; }
#endregion
#region Parent
/// <summary>
/// This property gets or sets the Parent componet or page for this object.
/// </summary>
public IBlazorComponentParent Parent { get; set; }
#endregion
#endregion
}
#endregion
}
Interface IBlazorComponentParent
#region using statements
using System.Collections.Generic;
#endregion
namespace DataJuggler.Blazor.Components.Interfaces
{
#region interface IBlazorComponentParent
/// <summary>
/// This interface is used to host IBlazorComponent objects
/// </summary>
public interface IBlazorComponentParent
{
#region Methods
#region FindChildByName(string name)
/// <summary>
/// This method is used to find a child component that has registered with the parent.
/// </summary>
/// <param name="name"></param>
/// <returns></returns>
IBlazorComponent FindChildByName(string name);
#endregion
#region ReceiveData(Message message)
/// <summary>
/// This method is used to send data from a child component to the parent component or page.
/// </summary>
/// <param name="data"></param>
void ReceiveData(Message message);
#endregion
#region Refresh()
/// <summary>
/// This method will call StateHasChanged to refresh the UI
/// </summary>
void Refresh();
#endregion
#region Register(IBlazorComponent component)
/// <summary>
/// This method is called by the Sprite to a subscriber so it can register with the subscriber, and
/// receiver events after that.
/// </summary>
void Register(IBlazorComponent component);
#endregion
#endregion
#region Properties
#region Children
/// <summary>
/// This property gets or sets the value for Children.
/// </summary>
public List<IBlazorComponent> Children { get; set; }
#endregion
#endregion
}
#endregion
}
For usage, here is the most relevant parts:
In your component, which is an IBlazorCompoent (child), there is a Parent property.
In your component, you set the parent like this:
<Login Parent=this></Login>
Then in your component, you alter the parent property like this:
[Parameter]
public IBlazorComponentParent Parent
{
get { return parent; }
set
{
// set the value
parent = value;
// if the Parent exists
(Parent != null)
{
// Register with the parent
Parent.Register(this);
}
}
}
Next, in your parent component that implements IBlazorComponentParent, add a property for your component and change the Register method to this:
// Login component reference
public Login LoginComponent { get; set; }
public void Register(IBlazorComponent component)
{
if (component is Login)
{
// Store the LoginComponent
LoginComponent = component as Login;
}
else if (component is Join)
{
// Store the compoent
SignUpComponent = component as Join;
}
}
Now at this point, my Login component knows about the parent and the parent knows about the Login, so I can sent messages like this:
From the child, send a simple message:
if (Parent != null)
{
Message message = new Message();
message.Text = "Some message";
Parent.SendMessage(message);
}
Or send a complex message
// create a message
DataJuggler.Blazor.Components.Message message = new DataJuggler.Blazor.Components.Message();
// Create the parameters to pass to the component
NamedParameter parameter = new NamedParameter();
// Set the name
parameter.Name = "PixelInformation Update";
parameter.Value = pixel;
// Create a new collection of 'NamedParameter' objects.
message.Parameters = new List<NamedParameter>();
// Add this parameter
message.Parameters.Add(parameter);
// Send this to the component
ColorPickerComponent.ReceiveData(message);
Then in the parent to receive the message:
public void ReceiveData(Message message)
{
// If the message object exists and has parameters
if ((message != null) && (message.HasParameters))
{
// if this a PixelInformation update from the Index page
if (message.Parameters[0].Name == "PixelInformation Update")
{
// this is only relevant to my app, just showing an example of
// \what I do with the data after it is received.
// Set the SelectedPixel
SelectedPixel = (PixelInformation) message.Parameters[0].Value;
// Set the properties from the Pixel to display
SetupColorPicker();
}
}
}
The above code is used in my newest site, PixelDatabase.Net https://pixeldatabase.net
The Nuget package code is all open source if anyone wants it:
DataJuggler.Blazor.Components
https://github.com/DataJuggler/DataJuggler.Blazor.Components
I come from a Windows Forms background, so I love being able to communicate between components like this, which data binding doesn't always work.
this.Login.DoSomething(data);
You can also cast the parent as a specific type like this:
public IndexPage ParentIndexPage
{
get
{
// cast the Parent object as an Index page
return this.Parent as IndexPage;
}
}
So your child can call methods or set properties on the parent, if the parent exists of course, so always add a:
public bool HasParentIndexPage
{
get
{
// return true if the ParentIndexPage exists
return (ParentIndexPage != null);
}
}
So then for easy usage from the child:
// if the parent index page exists
if (HasParentIndexPage)
{
// Safely call your parent page
ParentIndexPage.SomeMethod();
}
On way to do it would absolutely be to use the session pattern and inject the same instance in both components and then notify them onchange. A faster way would probably be to use the two way binding and eventcallbacks.
In ProvideNumberComponent.razor
<button class="btn btn-primary" #onclick="CalculateNumber">Provide Number</button>
#code {
[Parameter]
public EventCallback<int> OnRandomNumberSet{get; set;}
private void CalculateNumber(MouseEventArgs e)
{
Random rnd = new Random();
Int32 nextNumber = rnd.Next();
OnRandomNumberSet.InvokeAsync(nextNumber);
}
}
In ParentComponent.razor
<h1>Parent Page</h1>
<ProvideNumberComponent OnRandomNumberSet="((r) => SetRandomNumber(r))"/>
<DisplayNumberComponent TextAreaValue="_randomNumber" />
#code {
private int _randomNumber;
private void SetRandomNumber(int randomNumber)
{
_randomNumber = randomNumber;
}
}
In DisplayNumberComponent.razor
<h3>Displays number</h3>
<textarea cols="9" rows="1" bind:value="TextAreaValue" readonly style="font-family:monospace;" />
#code
{
[Parameter]
public int TextAreaValue{get; set;}
}
MDSN has an example using DI injected Notifier service
invoke component methods externally to update state, which should work for any component-relation (not only siblings).
At a steeper learning curve, but more maintenance-friendly + scaleable in the long run is the Flux/Redux library Fluxor
For anyone trying to get an overview of more "design-pattern"'ish solutions, MVVM is also a posibility, example here: MVVM example implementation 4 Blazor

Can you expose azure table storage IQueryable ( table.CreateQuery() ) as POCO?

I have an large application with 30 plus projects that currently uses an IRepository and POCO entities. I would like to know if there is a way to use table storage without having to implement ITableEntity. I don't want to have to import the azure storage nugget packages into every project and change all my entities to use ITableEntity.
Entity Adapater
I am aware that it is possible to create an entity adapter (such as that below) which works quite well when reading or writing an individual entity. But I have not been able to get this to work when attempting to expose IQueryable via table.CreateQuery().
public class AzureEntity
{
public Guid Id { get; set; }
public string PartitionKey { get; set; }
public string RowKey { get; set; }
public DateTimeOffset Timestamp { get; set; }
public string ETag { get; set; }
}
internal class AzureStorageEntityAdapter<T> : ITableEntity where T : AzureEntity, new()
{
#region Properties
/// <summary>
/// Gets or sets the entity's partition key
/// </summary>
public string PartitionKey
{
get { return InnerObject.PartitionKey; }
set { InnerObject.PartitionKey = value; }
}
/// <summary>
/// Gets or sets the entity's row key.
/// </summary>
public string RowKey
{
get { return InnerObject.RowKey; }
set { InnerObject.RowKey = value; }
}
/// <summary>
/// Gets or sets the entity's Timestamp.
/// </summary>
public DateTimeOffset Timestamp
{
get { return InnerObject.Timestamp; }
set { InnerObject.Timestamp = value; }
}
/// <summary>
/// Gets or sets the entity's current ETag.
/// Set this value to '*' in order to blindly overwrite an entity as part of an update operation.
/// </summary>
public string ETag
{
get { return InnerObject.ETag; }
set { InnerObject.ETag = value; }
}
/// <summary>
/// Place holder for the original entity
/// </summary>
public T InnerObject { get; set; }
#endregion
#region Ctor
public AzureStorageEntityAdapter()
{
// If you would like to work with objects that do not have a default Ctor you can use (T)Activator.CreateInstance(typeof(T));
this.InnerObject = new T();
}
public AzureStorageEntityAdapter(T innerObject)
{
this.InnerObject = innerObject;
}
#endregion
#region Methods
public virtual void ReadEntity(IDictionary<string, EntityProperty> properties, OperationContext operationContext)
{
TableEntity.ReadUserObject(this.InnerObject, properties, operationContext);
}
public virtual IDictionary<string, EntityProperty> WriteEntity(OperationContext operationContext)
{
return TableEntity.WriteUserObject(this.InnerObject, operationContext);
}
#endregion
}
I would like to be able to do something like this...
public class TableStorageRepository : IRepository
{
// snip...
public IQueryable<T> FindAll<T>() where T : class, new()
{
CloudTable table = GetCloudTable<T>();
return table.CreateQuery<AzureStorageEntityAdapter<T>>();
}
// snip...
}
The problem here is the CreateQuery creates an
IQueryable<AzureStorageEntityApater<T>>.
I can't see how to get an IQueryable of all the 'InnerObjects'.
Does anybody know if it is possible to expose IQueryable by some means without exposting ITableEntity?
This may or may not be what you want, but might give you some ideas.
I created a base repository and used a separate repository for each entity which is responsible for passing the correct CloudTable, partition/rowkey/property expressions and resolvers in. I base it around DynamicTableEntity (which allows for some advanced stuff like dynamic properties in my entities (like small collections)).
public class BaseRepository
{
protected async Task<DynamicTableEntity> GetAsync(CloudTable table, Expression<Func<DynamicTableEntity, bool>> filter)
{
var query = table.CreateQuery<DynamicTableEntity>().Where(filter).AsTableQuery();
var segment = await query.ExecuteSegmentedAsync(null);
return segment.Results.FirstOrDefault();
}
protected async Task<T> GetAsync<T>(CloudTable table, Expression<Func<DynamicTableEntity, bool>> filter, EntityResolver<T> resolver)
{
var query = table.CreateQuery<DynamicTableEntity>().Where(filter).Resolve(resolver);
var segment = await query.ExecuteSegmentedAsync(null);
return segment.Results.FirstOrDefault();
}
protected async Task<IEnumerable<DynamicTableEntity>> GetAllAsync(CloudTable table, Expression<Func<DynamicTableEntity, bool>> filter, int take = 1000)
{
if (take > 10000) take = 10000;
if (take < 1) take = 1;
var query = table.CreateQuery<DynamicTableEntity>().Where(filter).Take(take).AsTableQuery();
var token = new TableContinuationToken();
var results = new List<DynamicTableEntity>();
while (token != null)
{
var segment = await query.ExecuteSegmentedAsync(token);
results.AddRange(segment.Results);
token = segment.ContinuationToken;
}
return results;
}
protected async Task<IEnumerable<T>> GetAllAsync<T>(CloudTable table, Expression<Func<DynamicTableEntity, bool>> filter, EntityResolver<T> resolver, int take = 1000)
{
if (take > 10000) take = 10000;
if (take < 1) take = 1;
var query = table.CreateQuery<DynamicTableEntity>().Where(filter).Take(take).Resolve(resolver);
var token = new TableContinuationToken();
var results = new List<T>();
while (token != null)
{
var segment = await query.ExecuteSegmentedAsync(token);
results.AddRange(segment.Results);
token = segment.ContinuationToken;
}
return results;
}
protected async Task<int> InsertAsync(CloudTable table, DynamicTableEntity entity)
{
try
{
var result = await table.ExecuteAsync(TableOperation.Insert(entity));
return result.HttpStatusCode;
}
catch (StorageException ex)
{
return ex.RequestInformation.HttpStatusCode;
}
catch (Exception ex)
{
return 500;
}
}
protected async Task<int> ReplaceAsync(CloudTable table, DynamicTableEntity entity)
{
try
{
var result = await table.ExecuteAsync(TableOperation.Replace(entity));
return result.HttpStatusCode;
}
catch (StorageException ex)
{
return ex.RequestInformation.HttpStatusCode;
}
catch (Exception ex)
{
return 500;
}
}
protected async Task<int> DeleteAsync(CloudTable table, DynamicTableEntity entity)
{
try
{
var result = await table.ExecuteAsync(TableOperation.Delete(entity));
return result.HttpStatusCode;
}
catch (StorageException ex)
{
return ex.RequestInformation.HttpStatusCode;
}
catch (Exception ex)
{
return 500;
}
}
protected async Task<int> MergeAsync(CloudTable table, DynamicTableEntity entity)
{
try
{
var result = await table.ExecuteAsync(TableOperation.Merge(entity));
return result.HttpStatusCode;
}
catch (StorageException ex)
{
return ex.RequestInformation.HttpStatusCode;
}
catch (Exception ex)
{
return 500;
}
}
}
Example of a class inheriting from it (you'll have to use your imagination to fill in the blanks - let me know if you want to see a proper implementation)
// method
public Task<IEnumerable<T>> GetAllAsync<T>(string pk1, string pk2, EntityResolver<T> resolver, int take = 1000, Expression<Func<DynamicTableEntity, bool>> filterExpr = null)
{
var keysExpr = x => x.PartitionKey.Equals(string.Format("{0}_{1}", pk1, pk2);
var queryExpr = filterExpr != null ? keysExpr.AndAlso(filterExpr) : keysExpr;
return base.GetAllAsync<T>(CloudTableSelector.GetTable(), queryExpr, resolver, take);
}
// call
var products = await ProductRepo.GetAllAsync<ProductOwnerViewDto>(orgType, orgId, ProductOwnerViewDto.GetResolver(), take, x => x.RowKey.CompareTo(fromId) > 0);
It's a bit raw and a pain to wrap all your entities in separate repos, but I couldn't find a way to let me query the table in such a manner whilst letting me get different projections out (multiple resolvers per table).
I find solutions based on ITableEntity limiting (which is fine until you need dynamic properties then you're screwed).

Define a method with out argument

public class ArgParseHelper
{
/// <summary>
/// Constant for GuardMode "Report"
/// </summary>
private const string c_ModeReport = "REPORT";
/// <summary>
/// Constant for GuardMode "Enforce"
/// </summary>
private const string c_ModeEnforce = "ENFORCE";
public static bool TryGetSecurityGuardModeValue(string securityMode, out SecurityGuardMode securityGuardMode)
{
securityGuardMode = securityGuardMode = SecurityGuardMode.Enforce;
if (c_ModeEnforce.Equals(securityMode, StringComparison.OrdinalIgnoreCase))
{
return true;
}
else if (c_ModeReport.Equals(securityMode, StringComparison.OrdinalIgnoreCase))
{
securityGuardMode = SecurityGuardMode.Report;
return true;
}
return false;
}
}
I call this method as following :
SecurityGuardMode guardModeService;
ArgParseHelper m_GuardArgParseHelper = new GuardArgParseHelper();
if (m_GuardArgParseHelper.TryGetSecurityGuardModeValue(value, out guardModeService))
//<-compilation error "`cannot be accessed with an instance reference; qualify it with a type name instead`"
{
}
what is wrong?
You are accessing a static method passing by an instance.
You must use:
// Us the class name ArgParseHelper (where the static method is defined) not one
// of its instances
if (ArgParseHelper.TryGetSecurityGuardModeValue(..)) {
}

Repository Pattern For Accessing Text File

I am fairly new to the Repository Pattern and I would like to do this correctly. I am also trying to make use of Inversion of Control (also new).
I would like to make sure I am using the repository pattern correctly.
I picked this up as an example of a base interface for my repositories.
public interface IRepository<T> where T : class
{
IEnumerable<T> Find(Expression<Func<T, bool>> where);
IEnumerable<T> GetAll();
void Create(T p);
void Update(T p);
}
IPaymentRepository is intended for extensions to IRepository (although I don't see why I would need this if I have the Find method above)
public interface IPaymentRepository : IRepository<Payment>
{
}
PaymentRepository simply reads a text file and builds a POCO.
public class PaymentRepository : IPaymentRepository
{
#region Members
private FileInfo paymentFile;
private StreamReader reader;
private List<Payment> payments;
#endregion Members
#region Constructors
#endregion Constructors
/// <summary>
/// Initializes a new instance of the <see cref="PaymentRepository"/> class.
/// </summary>
/// <param name="paymentFile">The payment file.</param>
public PaymentRepository(FileInfo paymentFile)
{
if (!paymentFile.Exists)
throw new FileNotFoundException("Could not find the payment file to process.");
this.paymentFile = paymentFile;
}
#region Properties
#endregion Properties
#region Methods
public IEnumerable<Payment> Find(Expression<Func<Payment, bool>> where)
{
throw new NotImplementedException();
}
/// <summary>
/// Gets all payments from payment file.
/// </summary>
/// <returns>Collection of payment objects.</returns>
public IEnumerable<Payment> GetAll()
{
this.reader = new StreamReader(this.paymentFile.FullName);
this.payments = new List<Payment>();
while (!reader.EndOfStream)
{
string line = reader.ReadLine();
Payment payment = new Payment()
{
AccountNo = line.Substring(0, 11),
Amount = double.Parse(line.Substring(11, 10))
};
this.payments.Add(payment);
}
return this.payments;
}
public void Create(Payment p)
{
throw new NotImplementedException();
}
public void Update(Payment p)
{
throw new NotImplementedException();
}
#endregion Methods
I would like to know how to implement the Find method. I am assuming I would call GetAll and build an internal cache to the repository. For example, I would like to find all accounts that have payments greater than $50.
With your current IRepository signature you would implement it like this:
public IEnumerable<Payment> Find(Expression<Func<Payment, bool>> where)
{
this.reader = new StreamReader(this.paymentFile.FullName);
this.payments = new List<Payment>();
while (!reader.EndOfStream)
{
string line = reader.ReadLine();
Payment payment = new Payment()
{
AccountNo = line.Substring(0, 11),
Amount = double.Parse(line.Substring(11, 10))
};
if (where(payment)
{
this.payments.Add(payment);
}
}
return this.payments;
}
However, If your system memory allows it, you could keep a cached list (from GetAll()) and use Find() on the list. This should be an order of magnitude faster depending on the size of your list.

The entity type IdentityRole is not part of the model for the current context

I am having trouble implementing ASPNetIdentity on my MVC project
I am getting this error in the var line (The entity type IdentityRole is not part of the model for the current context.):
using System;
using System.Linq;
using System.Web.Mvc;
using EZ.Models;
using Microsoft.AspNet.Identity.EntityFramework;
namespace EZ.Controllers
{
public class RoleController : Controller
{
ApplicationDbContext context;
public RoleController()
{
context = new ApplicationDbContext();
}
/// <summary>
/// Get All Roles
/// </summary>
/// <returns></returns>
public ActionResult Index()
{
var roles = context.Roles.ToList();
return View(roles);
}
/// <summary>
/// Create a New role
/// </summary>
/// <returns></returns>
// GET: /Roles/Create
public ActionResult Create()
{
return View();
}
//
// POST: /Roles/Create
[HttpPost]
public ActionResult Create(FormCollection collection)
{
try
{
context.Roles.Add(new Microsoft.AspNet.Identity.EntityFramework.IdentityRole()
{
Name = collection["RoleName"]
});
context.SaveChanges();
ViewBag.ResultMessage = "Role created successfully !";
return RedirectToAction("Index");
}
catch
{
return View();
}
}
/// <summary>
/// Set Role for Users
/// </summary>
/// <returns></returns>
public ActionResult SetRoleToUser()
{
var list = context.Roles.OrderBy(role => role.Name).ToList().Select(role => new SelectListItem { Value = role.Name.ToString(), Text = role.Name }).ToList();
ViewBag.Roles = list;
return View();
}
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult UserAddToRole(string uname, string rolename)
{
ApplicationUser user = context.Users.Where(usr => usr.UserName.Equals(uname, StringComparison.CurrentCultureIgnoreCase)).FirstOrDefault();
// Display All Roles in DropDown
var list = context.Roles.OrderBy(role => role.Name).ToList().Select(role => new SelectListItem { Value = role.Name.ToString(), Text = role.Name }).ToList();
ViewBag.Roles = list;
if (user != null)
{
var account = new AccountController();
account.UserManager.AddToRoleAsync(user.Id, rolename);
ViewBag.ResultMessage = "Role created successfully !";
return View("SetRoleToUser");
}
else
{
ViewBag.ErrorMessage = "Sorry user is not available";
return View("SetRoleToUser");
}
}
}
}
I have scripted the tables in my DB.
This is the exact same code as in the role-security-mvc5-master project from CodeProject.com. The only difference is that I moved the tables in my DB ana dI changed the connection string. What is the piece I am missing?
in my IdentityModel.cs I have:
public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
public ApplicationDbContext()
: base("DefaultConnection", throwIfV1Schema: false)
{
}
public static ApplicationDbContext Create()
{
return new ApplicationDbContext();
}
}
If you need more code, please let me know and I will post.
When the project was created, identity, a database at locadb. when I moved the tables in my DB I overwrote the entire Default connection string with the one I created for E. The big probelm here was that the default connection needs providerName="System.Data.SqlClient" /> and NOT providerName="System.Data.EntityClient". Be careful there. Credit needs to go to this excellent article from Daniel Eagle: http://danieleagle.com/blog/2014/05/setting-up-asp-net-identity-framework-2-0-with-database-first-vs2013-update-2-spa-template/. Tons of detail on how to use Identity with DB first.

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