Asp.net 单击用户控件内的按钮后，关注aspx页面内的用户控件

我在aspx页面中有一个用户控件，在加载aspx页面后，当我单击该用户控件中的某个按钮时，我希望在该按钮单击操作完成并且再次加载aspx页面后，焦点回到用户控件

用户控件中需要有一个事件，允许.aspx页面订阅该事件，以便在表单发回后可以将焦点设置到用户控件中的元素，如下所示：

public class UserControlClass
{
    // Define event that will be raised by user control to anyone interested in handling the event
    public event UC_Button1ClickEventHandler UC_Button1Click;
    public delegate void UC_Button1ClickEventHandler();

    // Mechanism to allow event to be raised by user control
    private void Button1_Click(System.Object sender, System.EventArgs e)
    {
        if (UC_Button1Click != null) 
        {
            UC_Button1Click();
        }
    }
}

userControl1.UC_Button1Click += Button1_Click;

public void Button1_Click(object sender, EventArgs args)
{
    // Set focus here to user control element, text box for example
    ((TextBox)userControl.FindControl("TextBox1")).Focus();
}

现在，在.aspx页面中，您需要订阅用户控件中的事件，并说明实际处理该事件的方法，如下所示：

public class UserControlClass
{
    // Define event that will be raised by user control to anyone interested in handling the event
    public event UC_Button1ClickEventHandler UC_Button1Click;
    public delegate void UC_Button1ClickEventHandler();

    // Mechanism to allow event to be raised by user control
    private void Button1_Click(System.Object sender, System.EventArgs e)
    {
        if (UC_Button1Click != null) 
        {
            UC_Button1Click();
        }
    }
}

userControl1.UC_Button1Click += Button1_Click;

public void Button1_Click(object sender, EventArgs args)
{
    // Set focus here to user control element, text box for example
    ((TextBox)userControl.FindControl("TextBox1")).Focus();
}

最后，click事件处理程序需要存在，如下所示：

public class UserControlClass
{
    // Define event that will be raised by user control to anyone interested in handling the event
    public event UC_Button1ClickEventHandler UC_Button1Click;
    public delegate void UC_Button1ClickEventHandler();

    // Mechanism to allow event to be raised by user control
    private void Button1_Click(System.Object sender, System.EventArgs e)
    {
        if (UC_Button1Click != null) 
        {
            UC_Button1Click();
        }
    }
}

userControl1.UC_Button1Click += Button1_Click;

public void Button1_Click(object sender, EventArgs args)
{
    // Set focus here to user control element, text box for example
    ((TextBox)userControl.FindControl("TextBox1")).Focus();
}

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