asp.net-mvc – 构建与数据格式分离的ASP.NET MVC REST API的代

ASP.NET管道就是为此而设计的.控制器操作不会将结果返回给客户端,而是返回结果对象(ActionResult),然后在ASP.NET管道的后续步骤中处理.您可以覆盖ActionResult类.请注意,FileResult,JsonResult,ContentResult和FileContentResult是MVC3内置的.

在您的情况下,最好返回类似RestResult对象的东西.该对象现在负责根据用户请求(或您可能具有的任何其他规则)格式化数据：

public class RestResult<T> : ActionResult
{
    public override void ExecuteResult(ControllerContext context)
    {
        string resultString = string.Empty;
        string resultContentType = string.Empty;

        var acceptTypes = context.RequestContext.HttpContext.Request.AcceptTypes;

        if (acceptTypes == null)
        {
            resultString = SerializeToJsonFormatted();
            resultContentType = "application/json";
        }
        else if (acceptTypes.Contains("application/xml") || acceptTypes.Contains("text/xml"))
        {
            resultString = SerializeToXml();
            resultContentType = "text/xml";
        }

       context.RequestContext.HttpContext.Response.Write(resultString);
        context.RequestContext.HttpContext.Response.ContentType = resultContentType;
   }
}

反序列化

这有点棘手.我们正在使用Deserialize< T>基类控制器类的方法.请注意,此代码未准备好生产,因为读取整个响应可能会使服务器溢出：

protected T Deserialize<T>()
{
    Request.InputStream.Seek(0,SeekOrigin.Begin);
    StreamReader sr = new StreamReader(Request.InputStream);
    var rawData = sr.ReadToEnd(); // DON'T DO THIS IN PROD!

    string contentType = Request.ContentType;

    // Content-Type can have the format: application/json; charset=utf-8
    // Hence,we need to do some substringing:
    int index = contentType.IndexOf(';');
    if(index > 0)
        contentType = contentType.Substring(0,index);
    contentType = contentType.Trim();

    // Now you can call your custom deserializers.
    if (contentType == "application/json")
    {
        T result = ServiceStack.Text.JsonSerializer.DeserializeFromString<T>(rawData);                
        return result;
    }
    else if (contentType == "text/xml" || contentType == "application/xml")
    {
        throw new HttpException(501,"XML is not yet implemented!");
    }
}