检查字符串是否为整数 [英] checking string for integers

问题描述

好吧，这将是一个很奇怪的问题，不会撒谎.我有一台设备，当我按下按钮时，它会发送一个字符串，例如"135,125,154,458".我使用拆分和修剪"(Split and Trim)来获取所需的数字，并使用数字绘制一个矩形.但是，当我同时按下多个按钮时，它会发送奇怪的字符，因此会崩溃.我需要检查字符串，以确保它仅包含，"和数字"，以便如果没有其他内容，则该字符串不会通过.有办法吗?

Ok this is going to be a weird question not gonna lie. I have a device and when i hit a button it sends a string like "135,125,154,458". I use Split and Trim and get the numbers which I need and draw a rectangle using the numbers. However when i hit multiple buttons at the same time it sends weird characters therefore it crashes. I need to check the string to make sure it contains only "," and "numbers" so that if there is anything other than those it won''t pass it. Is there a way to do it?

private void InputBox_TextChanged(object sender, EventArgs e)
        {
            if (InputBox.Text.StartsWith("π") == false)//Clear the box if the message does not start with π
            {
                InputBox.Text = "";
            }
            if ((InputBox.Text.StartsWith("π") == true) && (InputBox.Text.EndsWith("}") == true))// only process if the message starts with π and ends with }
            {
                string Message = InputBox.Text;
                InputBox.Text = "";// Clear the box when done. 
                if (Message.StartsWith("πImageBox_Coordinates{") == true) ///Coordinates
                {
                    Message = Message.Substring(22);
                    Message = Message.TrimEnd(''}'');
                    string[] MessageSplit = Message.Split(new char[] { '','' });
                    for (int i = 0; i < MessageSplit.Count(); i++)
                    {
                        buttcorrs[i] = Convert.ToInt16(MessageSplit[i]);

它崩溃在我转换它的最后一行.当我一一击中它时效果很好，但我也需要多次击中，因此，如果有人有想法将不胜感激.

谢谢，

it crasher at the last line where i convert it. It works great when i hit it one by one but I also need multiple hits so if anyone has an idea would appreciate it.

Thank you,

推荐答案

我不得不花很多时间才能使它工作，因为我对正则表达式并不熟悉，但是这里我认为最有效的方法.

使用System.Text.RegularExpressions库.

其中有一个名为RegEx的类.
创建一个新的RegEx类，如:

I had to play around with it quite a bit to get it to work as I am not that familiar with regular expressions, but here''s what I believe will work best.

Use the System.Text.RegularExpressions library.

Within it is a class called RegEx.

Create a new RegEx class like:

Regex myRegEx = new RegEx("^\d+((,\d+)*)

")

(那是我从VB笨拙的转换)...在C#中不起作用.在C#中，应为:

(that was my clumsy conversion from VB)...that won''t work in C#. In C#, it should be:

RegEx myRegEx = new RegEx(@"^\d+((,\d+)*)

" );

");

然后，使用myRegEx.IsMatch(stringToTest)传递要匹配的字符串.

如果为真，则应仅包含字母数字和逗号.如果为假，则还有其他内容.

我测试了以下内容，并得到了以下结果:
"483,3929,2020" True
"3939,2902s，1292"错误
"A394"错误
"394,394" True
"394,394s"错误
"394" True

因此，在您不熟悉正则表达式的情况下，我将尽力解释它的作用.

脱字号(^)告诉它从头开始. "\ d +"告诉它寻找一个或多个数字.因此，第一个块"^ d \ +"表示从头开始并检查尽可能多的数字.然后移至下一个块(((，\ d +)*)

Then, pass the string you want to match in using myRegEx.IsMatch(stringToTest).

If it is true, then it should only have letters numbers and commas. If false, it has something else.

I tested the following and got the following results:
"483,3929,2020" True
"3939,2902s,1292" False
"A394" False
"394,394" True
"394,394s" False
"394" True

So, I''ll try to explain what it''s doing in case you aren''t familiar with regular expressions.

The caret (^) tells it to start at the beginning. "\d+" tells it to look for one or more digits. So the first block "^d\+" says "start at the beginning and check for as many digits as there are. Then it moves on to the next block ("((,\d+)*)

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