public static void Using()
{
var code = @"
namespace N
{
using System;
using System.IO;
internal class C
{
internal C(string fileName)
{
using (var disposable = File.OpenRead(fileName))
{
}
}
}
}";
var syntaxTree = CSharpSyntaxTree.ParseText(code);
var compilation = CSharpCompilation.Create("test", new[] { syntaxTree }, MetadataReferences.FromAttributes());
var semanticModel = compilation.GetSemanticModel(syntaxTree);
var value = syntaxTree.FindVariableDeclaration("disposable");
Assert.AreEqual(true, semanticModel.TryGetSymbol(value, CancellationToken.None, out ILocalSymbol symbol));
Assert.AreEqual(true, Disposable.Disposes(symbol, semanticModel, CancellationToken.None));
}
public static void WhenAddedToFormComponents()
{
var syntaxTree = CSharpSyntaxTree.ParseText(@"
namespace N
{
using System.IO;
using System.Windows.Forms;
public class Winform : Form
{
Winform()
{
var stream = File.OpenRead(string.Empty);
// Since this is added to components, it is automatically disposed of with the form.
this.components.Add(stream);
}
}
}");
var compilation = CSharpCompilation.Create("test", new[] { syntaxTree }, MetadataReferences.FromAttributes());
var semanticModel = compilation.GetSemanticModel(syntaxTree);
var value = syntaxTree.FindVariableDeclaration("stream = File.OpenRead(string.Empty)");
Assert.AreEqual(true, semanticModel.TryGetSymbol(value, CancellationToken.None, out ILocalSymbol symbol));
Assert.AreEqual(true, Disposable.Disposes(symbol, semanticModel, CancellationToken.None));
}
public static void IgnoreNewFormShow()
{
var syntaxTree = CSharpSyntaxTree.ParseText(@"
namespace N
{
using System.Windows.Forms;
public class Winform : Form
{
public static void M()
{
var form = new Winform();
form.Show();
}
}
}");
var compilation = CSharpCompilation.Create("test", new[] { syntaxTree }, MetadataReferences.FromAttributes());
var semanticModel = compilation.GetSemanticModel(syntaxTree);
var value = syntaxTree.FindVariableDeclaration("var form = new Winform()");
Assert.AreEqual(true, semanticModel.TryGetSymbol(value, CancellationToken.None, out ILocalSymbol symbol));
Assert.AreEqual(true, Disposable.Disposes(symbol, semanticModel, CancellationToken.None));
}