Is there any difference in Console.WriteLine("{0}, var)
本文关键字:var quot difference any there in Console WriteLine Is | 更新日期: 2023-09-27 18:12:13
下面的语句是否有错误?
var str = "Hello how are you.";
MessageBox.Show("{0}",str);
我的问题是在下面的代码中,我没有正确地得到它。下面的代码是学习过程的一部分。在MessageBox中,"指定"变量没有像我上面所说的那样出现!我最初张贴它,由于我的无知,当我测试的东西,我可以使用MessageBox像控制台。writeline()。
abstract class Employee //Abstract class
{
public virtual void WhichCoEmployee()
{
MessageBox.Show("I am employed in XYZ Corporation as its {0}", designation); //My problem was in this line.
//designation varaiable was not received in
//placeholder {0} for display in MessageBox.Show.
}
public void Designation(string desig)
{
designation = desig;
}
public string designation { get; set; }
}
class CEO : Employee //Inheritance
{
public void Name()
{
MessageBox.Show("My name is Satheeshkumar K");
}
}
private void button2_Click(object sender, EventArgs e)
{
CEO ceo = new CEO(); //Initializing the CEO class.
ceo.Name();
ceo.Designation("CEO");
ceo.WhichCoEmployee();
}
随后我纠正了MessageBox。通过更改显示问题消息框代码
MessageBox.Show("I am employed in XYZ Corporation as its " + designation);
效果很好。对此我没有更多要说的。由于其他成员的帮助,成为stackoverflow的一员确实帮助我学到了一些东西。
EDIT:
简单地改变
MessageBox.Show("I am employed in XYZ Corporation as its {0}", designation);
MessageBox.Show("I am employed in XYZ Corporation as its " + designation
);
顺便说一句,你需要在某个地方调用这个方法来运行代码!
。根据语法,您的两行似乎是完全正确的。 但是看起来你想要达到的和你已经做过的不一样。事情是这样的:你刚刚调用了 因此,在您的示例中,将显示一个带有"{0}"文本和"Hello how are you."标题的消息框。 而MessageBox
类的Show
方法的重载版本,它接受两个字符串。public static DialogResult Show(string text, string caption);
Console.WriteLine("{0}", var);
则完全不同。它用于将输出输出到控制台。它也有许多重载的变量,在这种情况下,它将用var
变量的值替换{0}。因此,"Hello how are you."将被输出到控制台。