StreamReader.ReadToEnd在C#中不起作用？

Question

我正在尝试序列化类Person的实例:

using System;
using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Soap;


[Serializable]
public class Person
{
    public string FirstName{ get; set; }
    public string MiddleName{ get; set; }
    public string LastName{ get; set; }
}

首先,我将对象序列化为JSON并将其写入MemoryStream,然后将其转换为字符串以在页面上显示它.

@using System.Runtime.Serialization.Json
@using System.Text


@{ Layout = null; 

    Person person = new Person();
    person.FirstName = "John";
    person.MiddleName = "Parker";
    person.LastName = "Santos";

    MemoryStream s = new MemoryStream();
    DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(Person));
    ser.WriteObject(s, person);
    string ss;

    using(StreamReader sr = new StreamReader(s, new UnicodeEncoding(), false))
    {
        ss = sr.ReadToEnd();
    }
}

@ss 

我希望最后一行打印对象的JSON格式,但事实并非如此.我怀疑StreamReader没有工作,因为MemoryStream的长度我认为数据已经有了,而ss的长度为0.我做错了什么？

Answer 1

您必须在读取之前将内存流的位置设置回到开头.

s.Position = 0;

应该解决你的问题.请参阅:http://msdn.microsoft.com/en-us/library/system.io.memorystream.position.aspx