跨線程時使用靜態擴展方法更新控件

在CodeProject上看一個跨線程更新的方法，備忘一下。
若是在應用中存在較多簡單的跨線程操做，下面的方法可能比較實用：

/// <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;

        }

 

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<br> public static class ExtensionMethod {      /// <summary>      /// 有返回值的擴展方法      /// </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>      /// 沒有返回值的擴展方法      /// </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);      }

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}

/// <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();
        }

而後在使用時就能夠使用匿名委託很方便的操做：

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1 2 3

lblProcent.SafeInvoke(d => d.Text = textForLabel); progressBar1.SafeInvoke(d => d.Value = i); string labelText = lblProcent.SafeInvoke(d => d.Text);

 

靜態的擴展類方法使用泛型模板擴展像全部可繼承 ISynchronizeInvoke 接口的控件，幾乎適用於常見的全部控件呦 （來自 CodeProject 爲全部類型的更新建立異步委託）

 

出處：https://www.cnblogs.com/zhangchenliang/p/4938556.html