Question

我想从不同的下拉列表中添加选定的值。我的代码有问题吗？因为当我点击按钮添加它们时没有显示任何内容。继承人的代码

 protected void btnSum_Click(object sender, EventArgs e)
{
    int a = Int32.Parse(ddlEval1.SelectedValue);
    int b = Int32.Parse(ddlEval2.SelectedValue);
    int c = Int32.Parse(ddlEval3.SelectedValue);
    int d = Int32.Parse(ddlEval4.SelectedValue);
    int f = Int32.Parse(ddlEval5.SelectedValue);
    txtScore.Text = Convert.ToString(a + b + c + d + f);
}

Answer 1

请尝试：

int sum = a + b + c + d + f;   //or double depending on your values.

txtScore.Text = Convert.ToString(sum);

Answer 2

我认为这会有效，但请考虑一些错误处理。当所选项目不包含整数表示时，您将获得异常。

protected void btnSum_Click(object sender, EventArgs e)
{
    int a = Int32.Parse(ddlEval1.SelectedItem.ToString());
    int b = Int32.Parse(ddlEval2.SelectedItem.ToString());
    int c = Int32.Parse(ddlEval3.SelectedItem.ToString());
    int d = Int32.Parse(ddlEval4.SelectedItem.ToString());
    int f = Int32.Parse(ddlEval5.SelectedItem.ToString());
    txtScore.Text = Convert.ToString(a + b + c + d + f);
}

Answer 3

替换：

txtScore.Text = Convert.ToString(a + b + c + d + f);

使用：

txtScore.Text = "" + (a + b + c + d + f);

文本框不显示公式的答案

3 个答案: