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.CheckAccess())
return control.Dispatcher.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.CheckAccess())
return control.Dispatcher.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.CheckAccess())
control.Dispatcher.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
}
