.NET从Textbox填充StreamReader

Question

我想解析streamReader中的用户输入.我的代码是:

string  txt = txtin.text ; //<~~ txtin is something like root:x:1:1....

using (TextReader reader = new TextReader( txt))
{
    string line = "";
    while ((line = reader.ReadLine()) != null)
    {
        string userName = line.Substring(0, line.IndexOf(':'));
    }
}

我收到此错误:

无法创建抽象类或接口'System.IO.TextReader'的实例

Answer 1

使用StringReader.TextReader是一个抽象类.您无法创建它的实例.

using (TextReader reader = new StringReader(txt))
{
  //...
}