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Dim length As Integer = If(customers?.Length, 0) ' 0 if customers is null

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if (x == null) throw new ArgumentNullException(nameof(x));

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If x Is Nothing Then Throw New ArgumentNullException(NameOf(x))

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public class Customer
{
    public string First { get; } = "Jane";
    public string Last { get; } = "Doe";
}

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open System
 
type T() =
    member __.F1(arg1 : string byref, arg2, arg3 : Nullable<int>, arg4 : bool) =
        arg1 <- arg1
        __.F2(arg1, arg2, arg3, arg4)
 
    member __.F2(_ : string, _ : obj, arg : Nullable<int>, _ : bool) =
        Console.WriteLine("{0}", arg) // prints "random" number
 

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// This repro documents a minimal example of the RyuJIT tail call issue (July 2015).
// All of the characteristics described in the repro need to be present to trigger the bad codegen. 
using System;
 
// Simple struct containing two integers (size 8).
struct MyStruct
{
    public MyStruct(int a, int b)
    {
        A = a;

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async Task SetupAsync()
{
    if (ApiInformation.IsTypePresent("Windows.UI.ViewManagement.StatusBar"))
    {
        await StatusBar.GetForCurrentView().HideAsync();
    }
}

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Expression<Func<int>> e = () => 1;
e = e.Update(Expression.Constant(2), null);
int i = e.Compile().Invoke(); // should return "2"

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<UseDotNetNativeToolchain>true</UseDotNetNativeToolchain> 
<UseDotNetNativeSharedAssemblyFrameworkPackage>true</UseDotNetNativeSharedAssemblyFrameworkPackage>

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Getting Started Writing a .NET Core app and Class Library

These instructions are basic and a work in progress. They will be improving a lot over time.

Once you've followed the steps in this document, use the following sample to see the changes you need to make to your project: https://github.com/dotnet/corefxlab/tree/master/samples/ClassLib.

Installing the tools