I have added a custom property to my workbook object like:
((XSSFWorkbook)workBook).getProperties().getCustomProperties().addProperty("fileNameSuffix" , "testName");
Now how can I read it back again.
Why there is no such method as getProperty(String key) ?
Do you mean like the method POIXMLProperties.CustomProperties.getProperty(String)? I think that should do what you want. Well, assuming you're on a new enough version of Apache POI to have it at least!
However, do note that it returns a CTProperty object, which is fairly low-level, and doesn't have an explicit type on it. You'll have to call the various isSetXXX methods to work out what kind it is, then getXXX to get the value.
There's an example of how to do that in POIXMLPropertiesTextExtractor
I figure a way to do it, but I do not really like it this way
List<CTProperty> customProperties = workBook.getProperties().getCustomProperties().getUnderlyingProperties().getPropertyList();
String fileNameSuffix = "";
for(int i = 0 ; i < customProperties.size() ; i++) {
CTProperty property = customProperties.get(i);
if (customProperties.get(i).getName().equals("testName"))
fileNameSuffix = property.getLpwstr(); // getLpwstr() will return the value of the property
}
Related
first time asking questions here. I'm having trouble sorting a listbox in a c++ form. I would much rather do this in C# but it's a class requirement unfortunately. Here's the code in question:
void updateCourseDisplay()
{
courseListBox->Items->Clear();
set<Course*> courseSet = courseControl->getCourseSet();
std::set<Course *>::iterator it;
for (it = courseSet.begin(); it != courseSet.end(); ++it)
{
Course * c = (*it);
String ^courseId = gcnew String((c->getID().c_str()));
String ^courseName = gcnew String((c->getName().c_str()));
courseListBox->Items->Add(courseId + " - " + courseName);
}
courseListBox->System::Windows::Forms::ListBox::Sort();
populateCopyStudentsComboBox();
}
I know this is pretty messy but I didn't want to mess around with creating managed objects to add to the form. The error I'm getting when I try and run this says that System::Windows::Forms::ListBox::Sort() would have been called but it is inaccessible. All I want is simple ordering of the list by the string value. Any thoughts?
Sort is a protected method that can not be accessed from the "outside". You should set the public Sorted property to true instead.
I was wondering if CsvHelper by Josh Close has anything in the configuration I am missing to translate values to null. I am a huge fan of this library, but I always thought there should be some sort of configuration to let it know what values represent NULL in your file. An example would be a column with the value "NA", "EMPTY", "NULL", etc. I am sure I could create my own TypeConverter, but I was hoping there would be an easier option to set somewhere in a config as this tends to be fairly common with files I encounter.
Is there a configuration setting to do this relatively easily?
I found the TypeConversion in the CsvHelper.TypeConversion namespace but am not sure where to apply something like this or an example of the correct usage:
new NullableConverter(typeof(string)).ConvertFromString(new TypeConverterOptions(), "NA")
I am also using the latest version 2.2.2
Thank you!
I think some time in the last seven years and thirteen versions since this question was asked the options for doing this without a custom type map class expanded, e.g.:
csvReader.Context.TypeConverterOptionsCache.GetOptions<string>().NullValues.Add("NULL");
csvReader.Context.TypeConverterOptionsCache.GetOptions<DateTime?>().NullValues.AddRange(new[] { "NULL", "0" });
csvReader.Context.TypeConverterOptionsCache.GetOptions<int?>().NullValues.Add("NULL");
csvReader.Context.TypeConverterOptionsCache.GetOptions<bool>().BooleanFalseValues.Add("0");
csvReader.Context.TypeConverterOptionsCache.GetOptions<bool>().BooleanTrueValues.Add("1");
CsvHelper can absolutely handle nullable types. You do not need to roll your own TypeConverter if a blank column is considered null. For my examples I am assuming you are using user-defined fluent mappings.
The first thing you need to do is construct a CsvHelper.TypeConverter object for your Nullable types. Note that I'm going to use int since strings allow null values by default.
public class MyClassMap : CsvClassMap<MyClass>
{
public override CreateMap()
{
CsvHelper.TypeConversion.NullableConverter intNullableConverter = new CsvHelper.TypeConversion.NullableConverter(typeof(int?));
Map(m => m.number).Index(2).TypeConverter(intNullableConverter);
}
}
Next is setting the attribute on your CsvReader object to allow blank columns & auto-trim your fields. Personally like to do this by creating a CsvConfiguration object with all of my settings prior to constructing my CsvReader object.
CsvConfiguration csvConfig = new CsvConfiguration();
csvConfig.RegisterClassMap<MyClassMap>();
csvConfig.WillThrowOnMissingField = false;
csvConfig.TrimFields = true;
Then you can call myReader = new CsvReader(stream, csvConfig) to build the CsvReader object.
IF you need to have defined values for null such as "NA" == null then you will need to roll your own CsvHelper.TypeConversion class. I recommend that you extend the NullableConverter class to do this and override both the constructor and ConvertFromString method. Using blank values as null is really your best bet though.
I used "ConvertUsing"...
public class RecordMap : CsvHelper.Configuration.ClassMap<Record>
{
public RecordMap()
{
AutoMap();
Map(m => m.TransactionDate).ConvertUsing( NullDateTimeParser );
Map(m => m.DepositDate).ConvertUsing( NullDateTimeParser );
}
public DateTime? NullDateTimeParser(IReaderRow row)
{
//"CurrentIndex" is a bit of a misnomer here - it's the index of the LAST GetField call so we need to +1
//https://github.com/JoshClose/CsvHelper/issues/1168
var rawValue = row.GetField(row.Context.CurrentIndex+1);
if (rawValue == "NULL")
return null;
else
return DateTime.Parse(rawValue);
}
}
How would I go about changing the default MCheckBox state text (currently I/0) to, for example, YES/NO or ON/OFF?
Mr. Daniel Kurka is the author for all the widget classes in MGWT. If the look & feel is not
fulfilling our requirement, We can edit those classes and rewrite them according to our requirement.Because they are open source. I done this on many classes like CellList,FormListEntry and MCheckBox. code for ON/OFF instead of I/O
public MyOwnCheckBox(CheckBoxCss css) {
this.css = css;
css.ensureInjected();
setElement(DOM.createDiv());
addStyleName(css.checkBox());
onDiv = DOM.createDiv();
onDiv.setClassName(css.on());
onDiv.setInnerText("ON");
getElement().appendChild(onDiv);
middleDiv = DOM.createDiv();
middleDiv.setClassName(css.middle());
Element middleContent = DOM.createDiv();
middleContent.setClassName(css.content());
middleDiv.appendChild(middleContent);
getElement().appendChild(middleDiv);
offDiv = DOM.createDiv();
offDiv.setClassName(css.off());
offDiv.setInnerText("OFF");
getElement().appendChild(offDiv);
addTouchHandler(new TouchHandlerImplementation());
setValue(true, false);
}
Write a new class like MyOwnCheckBox.just copy the code in MCheckBox and paste in your class MyOwnCheckBox, find and replace the MCheckBox with MyOwnCheckBox in the code(change constructor's name). do the following changes.
onDiv.setInnerText("ON");
offDiv.setInnerText("OFF");
and finally create object to MyOwnCheckBox rather MCheckBox, it'll shows MCheckBox with ON/OFF.
Right now there is no way to do that, but there is no real reasons that checkbox does not implement HasText other than we might need to update the css so that big text will not break the layout.
If you think mgwt should implement this go and vote for this issue: http://code.google.com/p/mgwt/issues/detail?id=171
Well, an easy way to accomplish the same thing, without creating a new class that mimics MCheckBox, is to do something like the code below:
CheckBoxCss css = MGWTStyle.getTheme().getMGWTClientBundle().getCheckBoxCss();
String offClass = css.off();
String onClass = css.on();
NodeList<Node> checkBoxElems;
mIsSingleSkuBox = new MCheckBox(css);
checkBoxElems = mIsSingleSkuBox.getElement().getChildNodes();
for( int i = 0; i < checkBoxElems.getLength(); i++ )
{
Element openElem = (Element) checkBoxElems.getItem(i);
String className = openElem.getClassName();
if( className.equals( offClass))
{
openElem.setInnerText("No" );
}
else if( className.equals( onClass))
{
openElem.setInnerText("Yes" );
}
}
It will probably have space problems with anything longer than 3 characters, but it works consistently with "Yes" and "No" for me.
I am trying to understand c# dynamic. I have an ExpandoObject instance assigned to dynamic variable.
I understand ExpandoObject is implementing IDictionary. But the below assignment fails.
dynamic obj = new ExpandoObject();
obj["Test"] = "TestValue";
Console.WriteLine(obj.Test);
Can someone tell me where i am going wrong?
obj.Test="TestValue";
However the above statement seems to be working fine.
To do that, you need to cast the ExpandoObject to IDictionary<string, object>.
This is normal Expando usage:
obj.Test = "TestValue";
This is string-literal (or string variable) usage:
var d = (IDictionary<string, object>)obj;
d["Test"] = "TestValue";
string s = "Test";
d[s] = "TestValue";
If the interface implementation is explicit, you need to cast to a reference of the interface in order to access the members. I'm guessing this is what has happened here.
I have data in a database, and my code is accessing it using LINQ to Entities.
I am writing some software where I need to be able to create a dynamic script. Clients may write the scripts, but it is more likely that they will just modify them. The script will specify stuff like this,
Dataset data = GetDataset("table_name", "field = '1'");
if (data.Read())
{
string field = data["field"];
while (cway.Read())
{
// do some other stuff
}
}
So that script above is going to read data from the database table called 'table_name' in the database into a list of some kind based on the filter I have specified 'field='1''. It is going to be reading particular fields and performing normal comparisons and calculations.
The most important thing is that this has to be dynamic. I can specify any table in our database, any filter and I then must be able to access any field.
I am using a script engine that means the script I am writing has to be written in C#. Datasets are outdated and I would rather keep away from them.
Just to re-iterate I am not really wanting to keep with the above format, and I can define any method I want to behind the scenes for my C# script to call. The above could end up like this for instance,
var data = GetData("table_name", "field = '1'");
while (data.ReadNext())
{
var value = data.DynamicField;
}
Can I use reflection for instance, but perhaps that would be too slow? Any ideas?
If you want to read dynamically a DataReader context, it's a pretty easy step:
ArrayList al = new ArrayList();
SqlDataReader dataReader = myCommand.ExecuteReader();
if (dataReader.HasRows)
{
while (dataReader.Read())
{
string[] fields = new string[datareader.FieldCount];
for (int i =0; i < datareader.FieldCount; ++i)
{
fields[i] = dataReader[i].ToString() ;
}
al.Add(fields);
}
}
This will return an array list composed by a dynamic object based on the number of field the reader has.