Publisher無法轉換爲字符串

Question

如何將字符串轉換爲標籤。

string str = "Test String"; 
object objString = (object)str; 

Label lbl = (Label)objString; //InvalidCastException was unhandled 

lbl.BackColor = Color.Red; 
lbl.ForeColor = Color.Red; 

Answer 1

String不Label ..（你不能轉換到StringLabel）

試試這個：

string str = "Test String"; 

Label lbl = new Label() { Text = str }; 

lbl.BackColor = Color.Red; 
lbl.ForeColor = Color.Red; 

Answer 2

其實你可以將字符串轉換爲標籤，用一些小技巧

public class myLabel:Label 
{ 
    public static explicit operator myLabel(string text) 
    { 
    myLabel lbl = new myLabel(); 
    lbl.Text = text; 
    return lbl; 
    } 
} 

然後在你的演示文稿

myLabel lbl = new myLabel(); 
    lbl = (myLabel)"abc1234"; 
    form1.Controls.Add(lbl);