RuntimeHelpers 類別

定義

public ref class RuntimeHelpers abstract sealed

public ref class RuntimeHelpers sealed

public static class RuntimeHelpers

[System.Serializable]
public sealed class RuntimeHelpers

type RuntimeHelpers = class

[<System.Serializable>]
type RuntimeHelpers = class

Public Class RuntimeHelpers

Public NotInheritable Class RuntimeHelpers

繼承

Object

RuntimeHelpers

屬性

SerializableAttribute

範例

下列範例示範如何使用 方法來可靠地設定句柄 PrepareConstrainedRegions 。 若要可靠地將句柄設定為指定的既有句柄，您必須確定原生句柄的配置，以及對象內 SafeHandle 該句柄的後續記錄是不可部分完成的。 這些作業之間的任何失敗 (例如線程中止或記憶體不足例外狀況，) 會導致原生句柄外洩。 您可以使用 PrepareConstrainedRegions 方法來確定句柄不會外洩。

[StructLayout(LayoutKind.Sequential)]
struct MyStruct
{
    public IntPtr m_outputHandle;
}

sealed class MySafeHandle : SafeHandle
{
    // Called by P/Invoke when returning SafeHandles
    public MySafeHandle()
        : base(IntPtr.Zero, true)
    {
    }

    public MySafeHandle AllocateHandle()
    {
        // Allocate SafeHandle first to avoid failure later.
        MySafeHandle sh = new MySafeHandle();

        RuntimeHelpers.PrepareConstrainedRegions();
        try { }
        finally
        {
            MyStruct myStruct = new MyStruct();
            NativeAllocateHandle(ref myStruct);
            sh.SetHandle(myStruct.m_outputHandle);
        }

        return sh;
    }

<StructLayout(LayoutKind.Sequential)> _
Structure MyStruct
    Public m_outputHandle As IntPtr
End Structure 'MyStruct


NotInheritable Class MySafeHandle
    Inherits SafeHandle

    ' Called by P/Invoke when returning SafeHandles
    Public Sub New()
        MyBase.New(IntPtr.Zero, True)

    End Sub


    Public Function AllocateHandle() As MySafeHandle
        ' Allocate SafeHandle first to avoid failure later.
        Dim sh As New MySafeHandle()

        RuntimeHelpers.PrepareConstrainedRegions()
        Try
        Finally
            Dim myStruct As New MyStruct()
            NativeAllocateHandle(myStruct)
            sh.SetHandle(myStruct.m_outputHandle)
        End Try

        Return sh

    End Function

屬性

方法

適用於