c# - PropertyInfo 上的 GetSetMethod 和 SetMethod 有什么区别？

Question

所以，PropertyInfo 有一个 GetSetMethod 方法，它返回这个属性的 setter 方法。它还有一个 SetMethod 属性(据我所知)。

我问这个是因为如果属性不是公共(public)的而 SetMethod 仍然有效，GetSetMethod 似乎返回 null。

我在 MSDN 上找不到太多内容。

Answer 1

你是对的。

来自 mscorlib(刚刚使用 dotPeek):

    /// <summary>
    /// Returns the public set accessor for this property.
    /// </summary>
    /// 
    /// <returns>
    /// The MethodInfo object representing the Set method for this property if the set accessor is public, or null if the set accessor is not public.
    /// </returns>
    [__DynamicallyInvokable]
    [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
    public MethodInfo GetSetMethod()
    {
      return this.GetSetMethod(false);
    }

    /// <summary>
    /// When overridden in a derived class, returns the set accessor for this property.
    /// </summary>
    /// 
    /// <returns>
    /// Value Condition A <see cref="T:System.Reflection.MethodInfo"/> object representing the Set method for this property. The set accessor is public.-or- <paramref name="nonPublic"/> is true and the set accessor is non-public. null<paramref name="nonPublic"/> is true, but the property is read-only.-or- <paramref name="nonPublic"/> is false and the set accessor is non-public.-or- There is no set accessor.
    /// </returns>
    /// <param name="nonPublic">Indicates whether the accessor should be returned if it is non-public. true if a non-public accessor is to be returned; otherwise, false. </param><exception cref="T:System.Security.SecurityException">The requested method is non-public and the caller does not have <see cref="T:System.Security.Permissions.ReflectionPermission"/> to reflect on this non-public method. </exception>
    [__DynamicallyInvokable]
    public abstract MethodInfo GetSetMethod(bool nonPublic);

    [__DynamicallyInvokable]
    public virtual MethodInfo SetMethod
    {
      [__DynamicallyInvokable, TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get
      {
        return this.GetSetMethod(true);
      }
    }