如何在C＃中的标签中显示剩余的文本框字符？ [英] How to display remaining textbox characters in a label in C#?

问题描述

我不确定我最后一个位是否正确？我将文本框的最大长度更改为140.我似乎不能使用 TextLength 。请帮助？！我到目前为止：

I'm not sure if I have the last bit right? I changed the max length of the textbox to 140. I can't seem to use TextLength. Help please?! I have this so far:

protected void textBox_TextChanged(object sender, EventArgs e)
{
    characterCountLabel.Text = textBox.MaxLength - textBox.TextLength;
}

推荐答案

characterCountLabel.Text 是字符串格式。所以你可能想要转换它之前你设置它的值，像这样：

characterCountLabel.Text is in string format. So you might want to convert it before you set its value like this:

protected void textBox_TextChanged(object sender, EventArgs e)
{
    characterCountLabel.Text = (textBox.MaxLength - textBox.Text.Length).ToString();
}

我想你正在尝试显示用户可以输入到文本框？我建议你可以设置限制为常数，如下：

I think you are trying to display the remaining characters the user can input to your text box? I suggest that you can set the limit as constant like this:

protected void textBox_TextChanged(object sender, EventArgs e)
    {
        characterCountLabel.Text = (140 - textBox.Text.Length).ToString(); // in here 140 is your limit
    }

如果您使用ASP.NET C＃。不要限制自己使用javascript 喜欢在此链接

If you are using ASP.NET in C#. Don't limit yourself from using javascript like in this link

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