如何在 C# 中切断来自串口的字符串？

Question

我从串行端口接收数据，并使用ReadLine获取此数据。 这是数据：

#MASTERPOSA,COM1,0,21.5,FINESTEERING,1544,340322.000,02000008,5009,4655;
SOL_COMPUTED,NARROW_INT,51.11604599076,-114.03855412002,1055.7756,16.9000,
WGS84,0.0090,0.0086,0.0143,"AAAA",0.0,0.0,13,13,13,12,0,0,0,0*a72e8d3f

我想获取数据直到AAAA ，即

#MASTERPOSA,COM1,0,21.5,FINESTEERING,1544,340322.000,02000008,5009,4655;
SOL_COMPUTED,NARROW_INT,51.11604599076,-114.03855412002,1055.7756,16.9000,
WGS84,0.0090,0.0086,0.0143

我使用了TrimEnd方法，但它不起作用：

textBox2.Text = data.TrimEnd(' ', '"').ToString();

Answer 1

使用Substring()方法将字符串从第一个索引“剪切”到“,AAAA”的索引

private static void Example()
{
  string target = "#MASTERPOSA,COM1,0,21.5,FINESTEERING,1544,340322.000,02000008,5009,4655; SOL_COMPUTED,NARROW_INT,51.11604599076,-114.03855412002,1055.7756,16.9000, WGS84,0.0090,0.0086,0.0143,\"AAAA\",0.0,0.0,13,13,13,12,0,0,0,0*a72e8d3f";
  string newstring = target.Substring(0, target.IndexOf(",\"AAAA\""));
  Console.WriteLine(newstring);
}

Answer 2

您可能会先找到"AAAA"索引（带有转义的双引号），然后使用Substring方法

var index = str.IndexOf("\"AAAA\"", StringComparison.Ordinal);
var result = str.Substring(0, index - 1);

它为您提供以下结果

#MASTERPOSA,COM1,0,21.5,FINESTEERING,1544,340322.000,02000008,5009,4655; SOL_COMPUTED,NARROW_INT,51.11604599076,-114.03855412002,1055.7756,16.9000,WGS84,0.0090,0.0086,0.0143

Answer 3

string text = "#MASTERPOSA,COM1,0,21.5,FINESTEERING,1544,340322.000,02000008,5009,4655; SOL_COMPUTED,NARROW_INT,51.11604599076,-114.03855412002,1055.7756,16.9000, WGS84,0.0090,0.0086,0.0143,\"AAAA\",0.0,0.0,13,13,13,12,0,0,0,0*a72e8d3f";
    
Regex regex = new Regex($"(^.*?)(\"AAAA\")", RegexOptions.IgnoreCase);//or other options

string newstring =  regex.Match(text).Groups[1].Value;

您可以使用任何正则表达式。 在这个例子中：

• Groups[0]：带有"AAAA"的必需文本
• Groups[1]：不带"AAAA"必填文本
• 组[2]： "AAAA"