public static void DisposedByReturnValueCallWrappingStreamInReader()
{
var code = @"
namespace N
{
using System.IO;
public class C
{
public string M()
{
using (var reader = GetReader(File.OpenRead(string.Empty)))
{
return reader.ReadLine();
}
}
private static StreamReader GetReader(Stream stream)
{
return new StreamReader(stream);
}
}
}";
var syntaxTree = CSharpSyntaxTree.ParseText(code);
var compilation = CSharpCompilation.Create("test", new[] { syntaxTree }, MetadataReferences.FromAttributes());
var semanticModel = compilation.GetSemanticModel(syntaxTree);
var value = syntaxTree.FindArgument("File.OpenRead(string.Empty)");
Assert.AreEqual(true, Disposable.DisposedByReturnValue(value, semanticModel, CancellationToken.None, out _));
}
public static void InLeaveOpen(string expression, bool stores)
{
var code = @"
namespace N
{
using System;
using System.IO;
using System.IO.Compression;
using System.Security.Cryptography;
using System.Text;
public class C
{
private readonly IDisposable disposable;
public C(Stream stream)
{
this.disposable = new BinaryReader(stream);
}
}
}".AssertReplace("new BinaryReader(stream)", expression);
var syntaxTree = CSharpSyntaxTree.ParseText(code);
var compilation = CSharpCompilation.Create("test", new[] { syntaxTree }, MetadataReferences.FromAttributes());
var semanticModel = compilation.GetSemanticModel(syntaxTree);
var value = syntaxTree.FindParameter("stream");
Assert.AreEqual(true, semanticModel.TryGetSymbol(value, CancellationToken.None, out var symbol));
Assert.AreEqual(true, LocalOrParameter.TryCreate(symbol, out var localOrParameter));
Assert.AreEqual(stores, Disposable.Stores(localOrParameter, semanticModel, CancellationToken.None, out var container));
Assert.AreEqual(stores, Disposable.DisposedByReturnValue(syntaxTree.FindArgument("stream"), semanticModel, CancellationToken.None, out _));
if (stores)
{
Assert.AreEqual("N.C.disposable", container.ToString());
}
}
public static void InHttpClient(string expression, bool stores)
{
var code = @"
namespace N
{
using System.Net.Http;
public class C
{
private readonly IDisposable disposable;
public C(HttpClientHandler handler)
{
this.disposable = new HttpClient(handler);
}
}
}".AssertReplace("new HttpClient(handler)", expression);
var syntaxTree = CSharpSyntaxTree.ParseText(code);
var compilation = CSharpCompilation.Create("test", new[] { syntaxTree }, MetadataReferences.FromAttributes());
var semanticModel = compilation.GetSemanticModel(syntaxTree);
var value = syntaxTree.FindParameter("handler");
Assert.AreEqual(true, semanticModel.TryGetSymbol(value, CancellationToken.None, out var symbol));
Assert.AreEqual(true, LocalOrParameter.TryCreate(symbol, out var localOrParameter));
Assert.AreEqual(stores, Disposable.Stores(localOrParameter, semanticModel, CancellationToken.None, out var container));
Assert.AreEqual(stores, Disposable.DisposedByReturnValue(syntaxTree.FindArgument("handler"), semanticModel, CancellationToken.None, out _));
if (stores)
{
Assert.AreEqual("N.C.disposable", container.ToString());
}
}
public static void FactoryMethod()
{
var code = @"
namespace N
{
using System;
using System.IO;
public sealed class Disposer : IDisposable
{
private readonly Stream stream;
private Disposer(Stream stream)
{
this.stream = stream;
}
public static Disposer M() => new Disposer(File.OpenRead(string.Empty));
public void Dispose()
{
this.stream.Dispose();
}
}
}";
var syntaxTree = CSharpSyntaxTree.ParseText(code);
var compilation = CSharpCompilation.Create("test", new[] { syntaxTree }, MetadataReferences.FromAttributes());
var semanticModel = compilation.GetSemanticModel(syntaxTree);
var value = syntaxTree.FindArgument("File.OpenRead(string.Empty)");
Assert.AreEqual(true, Disposable.DisposedByReturnValue(value, semanticModel, CancellationToken.None, out _));
}