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C# code:
string str = "abc-bdef-axdg";
Console.WriteLine(str.Substring(0, str.IndexOf("-")));


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C# code:
String.IndexOf


static void Main(string[] args)
  {

  string str = "abc-bdef-axdg";
  Console.WriteLine(str.IndexOf('-'));
  Console.ReadLine();

  }

C# code:
"abc-bdef-axdg".IndexOf("-")


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SubStringºÍString.IndexOf

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C# codestring str="abc-bdef-axdg";
Console.WriteLine(str.Substring(0, str.IndexOf("-")));
½á¹û-->>>abc

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String.IndexOf

string.Indexof

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