[英]EventHandler with FormClosingEventArgs - C#
我的Form.cs中有此结束表单代码
public void label7_Click(object sender, FormClosingEventArgs e)
{
MessageBox.Show("Are you sure you want to exit?", "Confirmation", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
if (MessageBox.Show("Are you sure you want to exit?", "Confirmation", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.No)
{
e.Cancel = true;
}
else {
Application.Exit();
}
}
和这段代码在我的Form.designer.cs中
this.label7.Click += new System.EventHandler(this.label7_Click);
但是它一直显示错误
“'label7_Click'的重载不匹配委托'System.EventHandler'”
我该怎么办?
似乎label7_Click方法不存在
this.label7.Click += new System.EventHandler(this.label7_Click);
void label7_Click(object sender, EventArgs e)
{
if (MessageBox.Show("Are you sure you want to exit?", "Confirmation", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.No)
{
//
}
else {
Application.Exit();
}
}
'label7_Click'没有重载匹配委托
public void label7_Click(object sender, FormClosingEventArgs e)//this method de is incorrect
具有FormClosingEventArgs
事件仅适用于Form.FormClosing
事件。 将代码更改为此:
public void label7_Click(object sender, EventArgs e)
{
if (MessageBox.Show("Are you sure you want to exit?", "Confirmation", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
{
this.Close(); //this closes the form
}
}
您试图将FormClosing事件的事件处理程序设置为标签的click事件。
这两个事件具有不同的签名,因此不兼容。
label_click(object sender, EventArgs e)
MyForm_FormClosing(object sender, FormClosingEventArgs e)
如果您打算在用户单击标签时关闭应用程序,则需要将事件处理程序更改为
label_click(object sender, EventArgs e)
{
if (MessageBox.Show("Are you sure you want to exit?", "Confirmation",
MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
{
this.Close();
}
}
如果您打算在用户尝试退出应用程序时要求进行确认,则需要向表单中添加一个FormClosing事件处理程序,然后编写
MyForm_FormClosing(object sender, FormClosingEventArgs e)
{
// NOTE, you don't want to abort closing when Windows shutdown, right?
if(e.CloseReason == CloseReason.UserClosing)
{
if (MessageBox.Show("Are you sure you want to exit?", "Confirmation",
MessageBoxButtons.YesNo, MessageBoxIcon.Question) ==
DialogResult.No)
{
e.Cancel = true;
}
}
}
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