c# - .NET 从文本框填充 StreamReader

Question

我想在 streamReader 中解析用户输入。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(':'));
    }
}

我收到这个错误:

Cannot create an instance of the abstract class or interface 'System.IO.TextReader'

Answer 1

使用StringReader . TextReader是一个抽象类。您不能创建它的实例。

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