public static void AssigningFieldGetAwaiterGetResult(string expression)
{
var code = @"
namespace N
{
using System;
using System.IO;
using System.Threading.Tasks;
public sealed class C : IDisposable
{
private IDisposable disposable;
public async Task M(string fileName)
{
this.disposable?.Dispose();
this.disposable = Task.FromResult(File.OpenRead(fileName));
}
public void Dispose()
{
this.disposable?.Dispose();
}
}
}".AssertReplace("Task.FromResult(File.OpenRead(fileName))", expression);
var syntaxTree = CSharpSyntaxTree.ParseText(code);
var compilation = CSharpCompilation.Create("test", new[] { syntaxTree }, MetadataReferences.FromAttributes());
var semanticModel = compilation.GetSemanticModel(syntaxTree);
var value = syntaxTree.FindExpression("File.OpenRead(fileName)");
Assert.AreEqual(true, Disposable.Assigns(value, semanticModel, CancellationToken.None, out var fieldOrProperty));
Assert.AreEqual("disposable", fieldOrProperty.Name);
}
public static void FieldAssignedViaCalledMethodParameter()
{
var code = @"
namespace N
{
using System;
internal class C
{
private IDisposable disposable;
internal C(IDisposable disposable)
{
this.M(disposable);
}
private void M(IDisposable disposable)
{
this.disposable = disposable;
}
}
}";
var syntaxTree = CSharpSyntaxTree.ParseText(code);
var compilation = CSharpCompilation.Create("test", new[] { syntaxTree }, MetadataReferences.FromAttributes());
var semanticModel = compilation.GetSemanticModel(syntaxTree);
var value = syntaxTree.FindParameter("IDisposable disposable");
var symbol = semanticModel.GetDeclaredSymbol(value, CancellationToken.None);
Assert.AreEqual(true, LocalOrParameter.TryCreate(symbol, out var localOrParameter));
Assert.AreEqual(true, Disposable.Assigns(localOrParameter, semanticModel, CancellationToken.None, out var field));
Assert.AreEqual("N.C.disposable", field.Symbol.ToString());
}
public static void WhenNotUsed()
{
var code = @"
namespace N
{
using System;
internal class C
{
internal C(IDisposable disposable)
{
}
}
}";
var syntaxTree = CSharpSyntaxTree.ParseText(code);
var compilation = CSharpCompilation.Create("test", new[] { syntaxTree }, MetadataReferences.FromAttributes());
var semanticModel = compilation.GetSemanticModel(syntaxTree);
var value = syntaxTree.FindParameter("IDisposable disposable");
var symbol = semanticModel.GetDeclaredSymbol(value, CancellationToken.None);
Assert.AreEqual(true, LocalOrParameter.TryCreate(symbol, out var localOrParameter));
Assert.AreEqual(false, Disposable.Assigns(localOrParameter, semanticModel, CancellationToken.None, out _));
}