如何从 streamreader 读取第一行的第一个字符？ （例如 txt 文件中的字母 H

Question

I need to read the first char from the first line and then others in a streamreader and if statements.

    private void buttonEdit_Click(object sender, EventArgs e)
    {
        NewSalariedEmployee newSalariedEmployee = new NewSalariedEmployee();
        HourlyEmployeeDetails hourlyEmployeeDetails = new HourlyEmployeeDetails();
        employees = new Employees();
        string firstLine;
        using (StreamReader reader = new StreamReader("employees.txt"))
        {
            firstLine = reader.ReadLine();
        }
        if (firstLine.Contains(firstLine.StartsWith("H"))
        {
            hourlyEmployeeDetails.ShowDialog();
        }
     }

The StreamReader.Read method that "Reads the next character from the input stream and advances the character position by one character." is not what I'm looking for...

Answer 1

If I understand what you are trying to do (though I'm guessing a bit).

If you are trying to read each line in a file and process the first character of each line, you just need a loop to keep reading lines until you have read them all. You can use the Peek method to see if you have more to read.

private void buttonEdit_Click(object sender, EventArgs e)
{
    NewSalariedEmployee newSalariedEmployee = new NewSalariedEmployee();
    HourlyEmployeeDetails hourlyEmployeeDetails = new HourlyEmployeeDetails();
    employees = new Employees();
    using (StreamReader reader = new StreamReader("employees.txt"))
    {
        // see if there is more to read from the reader
        while (reader.Peek() > -1)
        {
            // read the next line and perform your logic on the first char
            string currentLine = reader.ReadLine();
            if (currentLine != null && currentLine.StartsWith("H"))
            {
                hourlyEmployeeDetails.ShowDialog();
            }
        }
    }
}