如何从C＃中的字符串中查找输入键的索引（“\\\\ n”） [英] How Do I Find Index Of Enter Key("\r\n") from string In C#

问题描述

我挣扎了，在下面我已经详细提到了

Hi,
I got struggled,In below i have mentioned detaily

void _SerialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
 {

      sbSPBuffer.Append(_SerialPort.ReadExisting().ToString());
      if (sbSPBuffer.ToString().IndexOf(Global.LHScannerPrefix.Trim()) != -1)
      {
        //Operation
      }
  }

Global.LHScannerPrefix="\r\n";

GLobal.LHScannerPrefix 配置为回车键，具体取决于扫描仪，有时它可能是tab键（\t）;



我已经配置了带有后缀的串口扫描器作为回车键，所以每当我扫描任何条码时，它都会被扫描数据和输入键（\\\\ n）;

之后我将删除回车键，然后我做我的操作。



当我尝试从扫描的条形码中找到索引（ GLobal.LHScannerPrefix ）时，它找不到提到的值字符串。当我检查 GLobal.LHScannerPrefix 中的值时，它有\\\\\\ n



我怎样才能实现它。

GLobal.LHScannerPrefix is configured as enter key,It will vary depends upon scanner, sometimes it may be tab key(\t);

I have configured my serial Port scanner with suffix as enter key, So whenever i scan any barcode ,it will comes scanned data along with enter key(\r\n);
After that I will Remove the enter key ,then i do my opeations.

When i try to find the Index (GLobal.LHScannerPrefix) from scanned barcode ,its not find the mentioned value fom string. When i check the value in GLobal.LHScannerPrefix it is having "\\r\\n"

How can i achieve it.

推荐答案

你可以使用String类的IndexOf方法：

You can use the IndexOf method of String class:

string test = "This is a test string.\r\n";
int index = test.IndexOf("\r\n"); // index = 22

这篇关于如何从C＃中的字符串中查找输入键的索引（“\\\\ n”）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！