当从comobox中选择itom时，如何在文本框中传递值 [英] How can pass value in textbox when itom is selected from comobox

问题描述

我希望当用户从comobox中选择项目时，文本框会显示值：例如：4,5

示例;
当用户从comobox中选择A +时
textbox1自动显示4。

我想为很多comobox做这个，请帮助我:(



我尝试了什么：



i尝试过就好了;

浮动a =（浮动）Convert.ToDouble（textBox1。文字）;

if（comboBox1.Text ==A +）

{



textBox1.Text =4;

}

但不工作

I want that when user select item from comobox the textbox show the value: e.g:4, 5
EXAMPLE;
when user select "A+" from comobox the textbox1 show "4" automatically.
And i want to do this for many comobox so,please help me :(

What I have tried:

i have tried just like;
float a = (float)Convert.ToDouble(textBox1.Text);
if (comboBox1.Text == "A+")
{

textBox1.Text = "4";
}
but not working

推荐答案

试试这样

try like this

private void Form3_Load(object sender, EventArgs e)
      {
          DataTable dt = new DataTable();
          dt.Columns.Add("Value");
          dt.Columns.Add("Text");
          dt.Rows.Add("", "");
          dt.Rows.Add("1", "A");
          dt.Rows.Add("2", "B");
          dt.Rows.Add("3", "C");
          dt.Rows.Add("4", "A+");

          comboBox1.DisplayMember = "Text";
          comboBox1.ValueMember = "Text";
          comboBox1.DataSource = dt;


      }

      private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
      {
          textBox1.Text = (comboBox1.SelectedItem as DataRowView)[0].ToString();
      }

选择A +时，4将分配给文本框。

When you select A+ , 4 will assigned to Textbox.

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