在CodeProject上看一个跨线程更新的方法，备忘一下。
如果在应用中存在较多简单的跨线程操作，下面的方法可能比较实用：
/// <summary> /// /// </summary> private static object _object = new object(); /// <summary> /// /// </summary> private static T Instance; /// <summary> /// /// </summary> /// <returns></returns> public static T GetInstance() { if (Instance == null) { lock (_object) { if (Instance == null) { Instance = new T(); } } } return Instance; }
<br>public static class ExtensionMethod{ /// <summary> /// 有返回值的扩展方法 /// </summary> /// <typeparam name="T"></typeparam> /// <typeparam name="TResult"></typeparam> /// <param name="isi"></param> /// <param name="call"></param> /// <returns></returns> public static TResult SafeInvoke<T, TResult>(this T isi, Func<T, TResult> call) where T : ISynchronizeInvoke { if (isi.InvokeRequired) { IAsyncResult result = isi.BeginInvoke(call, new object[] { isi }); object endResult = isi.EndInvoke(result); return (TResult)endResult; } else return call(isi); } /// <summary> /// 没有返回值的扩展方法 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="isi"></param> /// <param name="call"></param> public static void SafeInvoke<T>(this T isi, Action<T> call) where T : ISynchronizeInvoke { if (isi.InvokeRequired) isi.BeginInvoke(call, new object[] { isi }); else call(isi); } |
} |
/// <summary> /// Generic Enum.Parse implementation. /// </summary> /// <typeparam name="TEnum">The enumeration type to parse to.</typeparam> /// <param name="strEnumValue">String value to parse.</param> /// <param name="defaultValue">Default value when conversion fails.</param> /// <returns>The parsed result or the default provided when parsing failed.</returns> public static TEnum ToEnum<TEnum>(this string strEnumValue, TEnum defaultValue) { if (!Enum.IsDefined(typeof(TEnum), strEnumValue)) return defaultValue; return (TEnum)Enum.Parse(typeof(TEnum), strEnumValue); } /// <summary> /// Invoke passed in action synchronously on the GUI thread of this item. /// </summary> /// <param name="me">The control.</param> /// <param name="action">Action that will be performed on the GUI thread.</param> public static void InvokeOnGui(this Control me, Action action) { if (me.InvokeRequired) me.Invoke(action); else action(); } /// <summary> /// Invoke passed in action asynchronously on the GUI thread of this item. Note: If this method is called /// on the GUI thread, the action will be performed synchronously. If it is called from another thread, it /// is invoked asynchronoulsly. /// </summary> /// <param name="me">The control.</param> /// <param name="action">Action that will be performed on the GUI thread.</param> public static void BeginInvokeOnGui(this Control me, Action action) { if (me.InvokeRequired) me.BeginInvoke(action); else action(); }
然后在使用时就可以使用匿名委托很方便的操作：
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lblProcent.SafeInvoke(d => d.Text = textForLabel);progressBar1.SafeInvoke(d => d.Value = i);string labelText = lblProcent.SafeInvoke(d => d.Text); |
静态的扩展类方法使用泛型模板扩展像所有可继承 ISynchronizeInvoke 接口的控件，几乎适用于常见的所有控件呦 （来自 CodeProject 为所有类型的更新创建异步委托）