Trying to list Azure Virtual Network and export to CSV using Powershell - azure

Question

I am trying to create a script that can list all the Azure virtual networks and export it into Csv using Powershell.
$day = Get-Date -Format " MMM-yyyy"
$path = "C:\Users\admin-vishal.singh\Desktop\Test\Report\"+ "$day-Vnet-Report.csv"
foreach ($Sub in $Subs) {
Select-AzSubscription -SubscriptionName $Sub.Name | Out-Null
$resource_grps = Get-AzResourceGroup
foreach ($resource_grp in $resource_grps) {
$networks = Get-AzVirtualNetwork
foreach ($vnet in $networks)
{
$null = Get-AzVirtualNetwork |Select-Object SubscriptionName,ResourceGroupName,Name,AddressSpace,Subnets,SubnetAddressSpace,RouteTable | Export-CSV -Path $path -NoTypeInformation -Encoding ASCII -Append
}
}
}
I am not able to retrieve data in the right format & getting errors when retrieving data.
Below is snippet of data
Lots of values I am not able to retrieve like Subnet AddressSpace, Route Tables and Routes.

Answer 1

Building on what Jim Xu provided, you don't need to have a separate loop for each ResourceGroup. Get-AzVirtualNetwork will return all virtual networks for the entire subscription. Also, you'll need an expression for the SubscriptionName in the Select-Object, so the code would look like this:
foreach ($Sub in $Subs) {
Select-AzSubscription -SubscriptionName $Sub.Name | Out-Null
Get-AzVirtualNetwork |
Select-Object `
#{label='SubscriptionName'; expression={$Sub.Name}}, `
ResourceGroupName, `
Name, `
#{label='AddressSpace'; expression={$_.AddressSpace.AddressPrefixes}}, `
#{label='SubnetName'; expression={$_.Subnets.Name}}, `
#{label='SubnetAddressSpace'; expression={$_.Subnets.AddressPrefix}} |
Export-CSV -Path $path -NoTypeInformation -Encoding ASCII -Append
}

Answer 2

When we call export-csv command, the property values are converted to strings using the ToString() method. But the result of Get-AzVirtualNetwork are object, we cannot directly convert the value to string. For more details, please refer to here and here
So regarding the issue, I suggest you create a custom object with the information you need then save it into csv.
For exmaple
$vents =Get-AzVirtualNetwork|
Select-Object SubscriptionName,ResourceGroupName,Name, #{
label='AddressSpace'
expression={$_.AddressSpace.AddressPrefix}}, #{
label='SubnetName'
expression={$_.Subnets.Name}
}, #{
label='SubnetAddressSpace'
expression={$_.Subnets.AddressPrefix}
}
$vents | convertto-csv