SafeInvoke

 

 

• • public static class  ExtensionControl
  • {                                              
  •       public static object GetPropertySafe(this Control control, string propertyName)
  •     {
  •         objectreturnValue = null;
  •         Action func = () =>
  •         {
  •             Type type = control.GetType();
  •              returnValue = type.InvokeMember(propertyName, BindingFlags.GetProperty, null, control, null);
  •         };
  •         if (control.InvokeRequired)
  •         {
  •              control.Invoke(func);
  •         }
  •         else
  •         {
  •              func();
  •         }
  •           returnreturnValue;
  •     }

 

• • public static object SetPropertySafe(this Control control, stringpropertyName, object value)
  •     {
  •          object  returnValue = null;
  •         Action func = () =>
  •         {
  •             Type type = control.GetType();
  •                   returnValue = type.InvokeMember(propertyName, BindingFlags.SetProperty, null, control, newobject[] { value });
  •         };
  •         if (control.InvokeRequired)
  •         {
  •              control.Invoke(func);
  •         }
  •         else
  •         {
  •               func();
  •         }
  •             returnreturnValue;
  •     }

 

• • public static object GetPropertySafe(this ToolStripMenuItem control, stringpropertyName)
  •     {
  •         object returnValue = null;
  •         Control owner = control.Owner;
  •         Action func = () =>
  •         {
  •             Type type = control.GetType();
  •             returnValue = type.InvokeMember(propertyName, BindingFlags.GetProperty, null, control, null);
  •         };
  •         if (owner.InvokeRequired)
  •         {
  •             owner.Invoke(func);
  •         }
  •         else
  •         {
  •               func();
  •         }
  •               returnreturnValue;
  •     }

 

• • public   static object SetPropertySafe(this.ToolStripMenuItem control, string propertyName, object value)
  •     {
  •          object returnValue = null;
  •         Control owner = control.Owner;
  •         Action func = () =>
  •         {
  •             Type type = control.GetType();
  •             returnValue = type.InvokeMember(propertyName, BindingFlags.SetProperty, null, control, newobject[] { value });               
  •         };
  •        if (owner.InvokeRequired)
  •         {
  •             owner.Invoke(func);
  •         }
  •       else
  •         {
  •              func();
  •         }
  •             returnreturnValue;
  •     }       

 

• • public static object InvokeMethodSafe(this Control control, stringmethodName, paramsobject[] args)
  •     {
  •       object returnValue = null;
  •       if (args == null)
  •         {
  •               args = newobject[1];
  •               args[0] = null;
  •         }
  •       else if (args != null&&args.Length == 0)
  •         {
  •              args = null;
  •         }
  •         Action func = () =>
  •         {
  •             Type type = control.GetType();               
  •              returnValue = type.InvokeMember(methodName, BindingFlags.InvokeMethod, null, control, args);
  •         };
  •        if (control.InvokeRequired)
  •         {
  •              control.Invoke(func);
  •         }
  •        else
  •         {
  •               func();
  •         }
  •              returnreturnValue;
  •     }

 

• 1. public static object    InvokeMethodSafe(thisToolStripMenuItem control, string methodName, paramsobject[] args)
  2.     {
  3.       object returnValue = null;
  4.       if (args == null)
  5.         {
  6.             args = newobject[1];
  7.             args[0] = null;
  8.         }
  9.        else if (args != null&&args.Length == 0)
  10.         {
  11.               args = null;
  12.         }
  13.         Control owner = control.Owner;
  14.         Action func = () =>
  15.         {
  16.             Type type = control.GetType();
  17.              returnValue = type.InvokeMember(methodName, BindingFlags.InvokeMethod, null, control, args);
  18.         };
  19.         if (owner.InvokeRequired)
  20.         {
  21.               owner.Invoke(func);
  22.         }
  23.          else
  24.         {
  25.                func();
  26.         }
  27.              returnreturnValue;
  28.     }
  29. }   

       

  30. namespace WindowsFormsApplication1

      {

      publicpartialclassMainForm : Form

          {       

              publicMainForm()

              {

                      InitializeComponent();

              }

       

      privatevoid button1_Click(object sender, EventArgs e)

              {

                  Thread thread = newThread(

                   ThreadStart =>

                      {

                            //this.textBox1.Text = "Thread Edit";

                          //將上方會產生InvalidOperationException的代碼註解，改以下方代碼

                           this.textBox1.SetPropertySafe("Text", "ThreadEdit");

                      }

                  );

                thread.IsBackground = true;

                 thread.Start();

              }

          }

      }