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System.InvalidCastException: Unable to cast object of type 'System.String' to type 'Cookie.Dozen'. at Cookie.CookieSource.listBox1_SelectedIndexChanged(Object sender, EventArgs e) in Form1.cs:line 112
线112以下:为什么我得到这个错误窗口形式?
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
this.dozen = (Dozen) this.listBox1.SelectedItem;
this.CostChosenLb.ResetText();
}
我想要做的是,当我选择从列表框中的项目之一,它会在文本框中显示的价格。但每当我尝试这样做时,我都会遇到上述错误。帮帮我!
什么是'this.dozen'的类型 – Hexie