AirScout/ElevationCoverageMapper/WindowsFormsControlInvoke.cs

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Windows.Forms;

namespace ElevationCoverageMapper
{
    /// <summary>
    /// A set of methods that are much easier to use than the usual <see cref="Control.Invoke"/> versions, since they
    /// accept the standard delegate types as arguments.
    /// </summary>
    /// <remarks>
    /// Instead of using the version of <see cref="Control.Invoke"/> that allows you to pass parameters to your
    /// delegate, just capture them in a closure when using one of these.
    /// </remarks>
    public static class WindowsFormsControlInvoke
    {
        /// <summary>
        /// Executes the specified delegate on the thread that owns the control's underlying window handle.
        /// </summary>
        /// <param name="control">The control whose window handle the delegate should be invoked on.</param>
        /// <param name="method">A delegate that contains a method to be called in the control's thread context.</param>
        public static void Invoke(this Control control, Action method)
        {
            if (control.InvokeRequired)
            {
                control.Invoke(method);
            }
            else
            {
                method();
            }
        }

        /// <summary>
        /// Executes the specified delegate on the thread that owns the control's underlying window handle, returning a
        /// value.
        /// </summary>
        /// <param name="control">The control whose window handle the delegate should be invoked on.</param>
        /// <param name="method">A delegate that contains a method to be called in the control's thread context and
        /// that returns a value.</param>
        /// <returns>The return value from the delegate being invoked.</returns>
        public static TResult Invoke<TResult>(this Control control, Func<TResult> method)
        {
            if (control.InvokeRequired)
            {
                return (TResult)control.Invoke(method);
            }
            else
            {
                return method();
            }
        }
    }
}