C# Extract only unique numbers from a String

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Ready to use method to extract only unique numbers from a string.

// this is the string that you will be passing from another class
string str = "1H2e34e5689563112o5#6@@7*^8)-9U0";

// This is the method you can use to process your string
public string GetUniqueNumbersFromAString(string str){

  string onlyUniqueNumbers = "";

  for (int i = 0; i < str.Count(); i++)
  {
      if (char.IsDigit(str[i]))
      {
          if (!onlyUniqueNumbers.Contains(str[i]))
          {
              onlyUniqueNumbers += str[i];
          }
      }
      return onlyUniqueNumbers;
  }

// returned string output: 1234567890

Instructions:
To use the method – copy and paste it in your class, rename string variables and enter or pass a string you need to extract unique numbers from.

C# Methods