C#多线程异步执行和跨线程访问控件Helper怎么用
本文小编为大家详细介绍“C#多线程异步执行和跨线程访问控件Helper怎么用”，内容详细，步骤清晰，细节处理妥当，希望这篇“C#多线程异步执行和跨线程访问控件Helper怎么用”文章能帮助大家解决疑惑，下面跟着小编的思路慢慢深入，一起来学习新知识吧。
一、工具类代码
public class TaskHelper
{
#region 多线程操作
/// <summary>
/// 功能描述:多线程执行方法，方法无参数，无返回值
/// </summary>
/// <param name="func">方法，如果方法中调用了控件，请使用 ThreadInvokerControl(() => { 您的操作})进行包括</param>
/// <param name="callback">执行完成回调,参数为object，如果错误返回的是Exception，否则为null，如果为空则默认调用基类回调方法</param>
/// <param name="enableControl">调用线程时禁用的控件</param>
public static void TaskRun(
Form frm,
Func<Task> func,
Action<object> callback = null,
Control[] enableControl = null)
{
if (enableControl != null)
{
SetControlEnableds(enableControl, false);
}
Task.Factory.StartNew(() =>
{
try
{
Task task = func();
if (task.Exception != null && task.Exception.InnerException != null)
throw task.Exception.InnerException;
callback?.Invoke(null);
}
catch (Exception ex)
{
if (callback != null)
callback(ex);
else
ThreadBaseCallBack(frm, ex);
}
finally
{
if (enableControl != null && frm != null)
ThreadInvokerControl(frm, () => { SetControlEnableds(enableControl, true); });
}
});
}
/// <summary>
/// 功能描述:线程默认回调方法
/// </summary>
public static void ThreadBaseCallBack(Form frm, Exception ex)
{
if (frm != null)
{
ThreadInvokerControl(frm, () =>
{
try
{
Exception lastEx = ex.GetOriginalException();
MessageBox.Show(lastEx.Message);
}
catch
{
}
});
}
}
/// <summary>
/// 功能描述:委托调用，用于夸线程访问控件
/// </summary>
/// <param name="action">action</param>
/// <param name="f">所在窗体，默认使用当前窗体</param>
public static void ThreadInvokerControl(Form frm, Action action)
{
if (frm != null)
{
if (frm.InvokeRequired)
{
frm.BeginInvoke(action);
}
else
{
action();
}
}
}
#endregion
#region 提示层
[DllImport("user32.dll")]
private static extern bool SetForegroundWindow(IntPtr hWnd);
private static void ShowProcessPanel(Control parent, string strMessage)
{
if (parent.InvokeRequired)
{
parent.BeginInvoke(new MethodInvoker(delegate
{
ShowProcessPanel(parent, strMessage);
}));
}
else
{
parent.VisibleChanged -= new EventHandler(parent_VisibleChanged);
parent.VisibleChanged += new EventHandler(parent_VisibleChanged);
parent.FindForm().FormClosing -= ControlHelper_FormClosing;
parent.FindForm().FormClosing += ControlHelper_FormClosing;
Control control = null;
lock (parent)
{
control = HaveProcessPanelControl(parent);
if (control == null)
{
control = CreateProgressPanel();
parent.Controls.Add(control);
}
}
FWaiting fWaiting = control.Tag as FWaiting;
fWaiting.Message = strMessage;
fWaiting.Show();
}
}
private static void ControlHelper_FormClosing(object sender, FormClosingEventArgs e)
{
Control control = sender as Control;
control.FindForm().FormClosing -= ControlHelper_FormClosing;
CloseWaiting(control);
}
private static void parent_VisibleChanged(object sender, EventArgs e)
{
Control control = sender as Control;
control.VisibleChanged -= new EventHandler(parent_VisibleChanged);
if (!control.Visible)
{
CloseWaiting(control);
}
}
private static void CloseWaiting(Control control)
{
Control[] array = control.Controls.Find("myProgressPanelext", false);
if (array.Length > 0)
{
Control myProgress = array[0];
if (myProgress.Tag != null && myProgress.Tag is FWaiting)
{
FWaiting fWaiting = myProgress as FWaiting;
if (fWaiting != null && !fWaiting.IsDisposed && fWaiting.Visible)
{
fWaiting.Hide();
}
}
}
}
private static void CloseProcessPanel(Control parent)
{
if (parent.InvokeRequired)
{
parent.BeginInvoke(new MethodInvoker(delegate
{
CloseProcessPanel(parent);
}));
}
else if (parent != null)
{
Control control = HaveProcessPanelControl(parent);
if (control != null)
{
Form frm = control.Tag as Form;
if (frm != null && !frm.IsDisposed && frm.Visible)
{
if (frm.InvokeRequired)
{
frm.BeginInvoke(new MethodInvoker(delegate
{
frm.Hide();
}));
}
else
{
frm.Hide();
}
}
}
}
}
private static Control HaveProcessPanelControl(Control parent)
{
Control[] array = parent.Controls.Find("myProgressPanelext", false);
Control result;
if (array.Length > 0)
{
result = array[0];
}
else
{
result = null;
}
return result;
}
private static Control CreateProgressPanel()
{
return new Label
{
Name = "myProgressPanelext",
Visible = false,
Tag = new FWaiting
{
TopMost = true,
}
};
}
#endregion
#region 禁用控件时不改变空间颜色
[System.Runtime.InteropServices.DllImport("user32.dll ")]
private static extern int SetWindowLong(IntPtr hWnd, int nIndex, int wndproc);
[System.Runtime.InteropServices.DllImport("user32.dll ")]
private static extern int GetWindowLong(IntPtr hWnd, int nIndex);
private const int GWL_STYLE = -16;
private const int WS_DISABLED = 0x8000000;
/// <summary>
/// 功能描述:设置控件的Enable属性，控件不改颜色
/// </summary>
/// <param name="c">c</param>
/// <param name="enabled">enabled</param>
private static void SetControlEnabled(Control c, bool enabled)
{
if (enabled)
{
SetWindowLong(c.Handle, GWL_STYLE, (~WS_DISABLED) & GetWindowLong(c.Handle, GWL_STYLE));
}
else
{
SetWindowLong(c.Handle, GWL_STYLE, WS_DISABLED + GetWindowLong(c.Handle, GWL_STYLE));
}
}
/// <summary>
/// 功能描述:设置多个控件的Enable属性，控件不改颜色
/// </summary>
/// <param name="cs">cs</param>
/// <param name="enabled">enabled</param>
private static void SetControlEnableds(Control[] cs, bool enabled)
{
foreach (var c in cs)
{
SetControlEnabled(c, enabled);
}
}
#endregion
}二、调用代码
TaskHelper.TaskRun(this, async () =>
{
TaskHelper.ThreadInvokerControl(this, () =>
{
//夸线程访问控件的
this.btnStart.Enabled = true;
this.btnStart.BackColor = Color.Gainsboro;
});
});读到这里，这篇“C#多线程异步执行和跨线程访问控件Helper怎么用”文章已经介绍完毕，想要掌握这篇文章的知识点还需要大家自己动手实践使用过才能领会，如果想了解更多相关内容的文章，欢迎关注蜗牛博客行业资讯频道。
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