跨线程访问控件类

使用方法：InvokeHelper.Set(this.label1, "Visible", false);

/*******************************************************************************
* InvokeHelper.cs
* A thread-safe control invoker helper class.
* -----------------------------------------------------------------------------
* Project:Conmajia.Controls
* Author:Conmajia
* Url:conmajia@gmail.com
* History:
* 4th Aug., 2012
* Added support for "Non-control" controls (such as ToolStripItem).
*
* 4th Aug., 2012
* Initiated.
******************************************************************************/
using System;
using System.Collections.Generic;
using System.Reflection;
using System.Text;
using System.Windows.Forms;

namespace InvokerHelperDemo
{
/// <summary>
/// A thread-safe control invoker helper class.
/// </summary>
public class InvokeHelper
{
#region delegates
private delegate object MethodInvoker(Control control, string methodName, params object[] args);

private delegate object PropertyGetInvoker(Control control, object noncontrol, string propertyName);
private delegate void PropertySetInvoker(Control control, object noncontrol, string propertyName, object value);
#endregion

#region static methods
// helpers
private static PropertyInfo GetPropertyInfo(Control control, object noncontrol, string propertyName)
{
if (control != null && !string.IsNullOrEmpty(propertyName))
{
PropertyInfo pi = null;
Type t = null;

if (noncontrol != null)
t = noncontrol.GetType();
else
t = control.GetType();

pi = t.GetProperty(propertyName);

if (pi == null)
throw new InvalidOperationException(
string.Format(
"Can't find property {0} in {1}.",
propertyName,
t.ToString()
));

return pi;
}
else
throw new ArgumentNullException("Invalid argument.");
}

// outlines
public static object Invoke(Control control, string methodName, params object[] args)
{
if (control != null && !string.IsNullOrEmpty(methodName))
if (control.InvokeRequired)
return control.Invoke(
new MethodInvoker(Invoke),
control,
methodName,
args
);
else
{
MethodInfo mi = null;

if (args != null && args.Length > 0)
{
Type[] types = new Type[args.Length];
for (int i = 0; i < args.Length; i++)
{
if (args[i] != null)
types[i] = args[i].GetType();
}

mi = control.GetType().GetMethod(methodName, types);
}
else
mi = control.GetType().GetMethod(methodName);

// check method info you get
if (mi != null)
return mi.Invoke(control, args);
else
throw new InvalidOperationException("Invalid method.");
}
else
throw new ArgumentNullException("Invalid argument.");
}

public static object Get(Control control, string propertyName)
{
return Get(control, null, propertyName);
}
public static object Get(Control control, object noncontrol, string propertyName)
{
if (control != null && !string.IsNullOrEmpty(propertyName))
if (control.InvokeRequired)
return control.Invoke(new PropertyGetInvoker(Get),
control,
noncontrol,
propertyName
);
else
{
PropertyInfo pi = GetPropertyInfo(control, noncontrol, propertyName);
object invokee = (noncontrol == null) ? control : noncontrol;

if (pi != null)
if (pi.CanRead)
return pi.GetValue(invokee, null);
else
throw new FieldAccessException(
string.Format(
"{0}.{1} is a write-only property.",
invokee.GetType().ToString(),
propertyName
));

return null;
}
else
throw new ArgumentNullException("Invalid argument.");
}

public static void Set(Control control, string propertyName, object value)
{
Set(control, null, propertyName, value);
}
public static void Set(Control control, object noncontrol, string propertyName, object value)
{
if (control != null && !string.IsNullOrEmpty(propertyName))
if (control.InvokeRequired)
control.Invoke(new PropertySetInvoker(Set),
control,
noncontrol,
propertyName,
value
);
else
{
PropertyInfo pi = GetPropertyInfo(control, noncontrol, propertyName);
object invokee = (noncontrol == null) ? control : noncontrol;

if (pi != null)
if (pi.CanWrite)
pi.SetValue(invokee, value, null);
else
throw new FieldAccessException(
string.Format(
"{0}.{1} is a read-only property.",
invokee.GetType().ToString(),
propertyName
));
}
else
throw new ArgumentNullException("Invalid argument.");
}
#endregion
}
}