c# - "button_click"没有重载匹配委托(delegate) 'System.EventHandler'

Question

我正在尝试从数据文件和列表框中删除一行。但我收到错误:'removeButton_Click' 的重载不匹配委托(delegate) 'System.EventHandler'。我该如何解决这个错误？

public partial class Message_ReaderMainForm : Form
{
private void validSitesListBox_SelectedIndexChanged(object sender, EventArgs e)
    {
        removeButton.Visible = true;
        moveButton.Visible = true;
        editButton.Visible = true;

        removeButton_Click(sender, e, validSitesListBox.SelectedIndex);
    }

    private void removeButton_Click(object sender, EventArgs e, int location)
    {
        StreamWriter file = new StreamWriter("userFile.txt");

        validSitesListBox.Items.RemoveAt(location);
        data.RemoveAt(location);

        for (int i = 0; i < data.Count(); i++)
        {
            file.WriteLine(data[i].Item1 + " " + data[i].Item2 + " " + data[i].Item3);
        }

    }

}

这是错误发生的位置:

 partial class Message_ReaderMainForm
{
        // 
        // removeButton
        // 
        this.removeButton.Location = new System.Drawing.Point(255, 351);
        this.removeButton.Margin = new System.Windows.Forms.Padding(2);
        this.removeButton.Name = "removeButton";
        this.removeButton.Size = new System.Drawing.Size(59, 21);
        this.removeButton.TabIndex = 5;
        this.removeButton.Text = "Remove";
        this.removeButton.UseVisualStyleBackColor = true;
    // This is where the error is showing up in the code.
        this.removeButton.Click += new System.EventHandler(this.removeButton_Click);
}

Answer 1

这是因为你声明了它

private void removeButton_Click(object sender, EventArgs e, int location)

int location 参数表示它与 System.EventHandler 委托(delegate)定义不匹配。如果您想将其用作事件处理程序并通过其他方式获取 location，则需要删除该参数。