webapi 返回不同格式的数据-优快云博客

本文介绍如何使用WebAPI返回不同类型的响应，包括JSON数据、图片文件和纯文本字符串。通过具体代码示例展示了如何配置响应类型并返回相应内容。

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     //默认返回 json             GlobalConfiguration.Configuration.Formatters.XmlFormatter.SupportedMediaTypes.Clear();

            GlobalConfiguration.Configuration.Formatters.JsonFormatter.MediaTypeMappings.Add(                 new QueryStringMapping("datatype", "json", "application/json"));

            ////返回格式选择 datatype 可以替换为任何参数               //GlobalConfiguration.Configuration.Formatters.XmlFormatter.MediaTypeMappings.Add(             //    new QueryStringMapping("datatype", "xml", "application/xml"));
using System.IO;
/// <summary>
/// WebApi返回图片
/// </summary>
public HttpResponseMessage GetQrCode()
{
var imgPath = @"D:\ITdosCom\Images\itdos.jpg";
//从图片中读取byte
var imgByte = File.ReadAllBytes(imgPath);
//从图片中读取流
var imgStream = new MemoryStream(File.ReadAllBytes(imgPath));
var resp = new HttpResponseMessage(HttpStatusCode.OK)
{
Content = new ByteArrayContent(imgByte)
//或者
//Content = new StreamContent(stream)
};
resp.Content.Headers.ContentType = new MediaTypeHeaderValue("image/jpg");
return resp;
}
/// <summary>
/// WebApi返回json数据
/// </summary>
public HttpResponseMessage GetQrCode()
{
var jsonStr = "{\"IsSuccess\":true,\"Data\":\"www.itdos.com\"}";
var result = new HttpResponseMessage(HttpStatusCode.OK)
{
Content = new StringContent(jsonStr, Encoding.UTF8, "text/json")
};
return result;
}
/// <summary>
/// WebApi返回字符串
/// </summary>
public HttpResponseMessage GetQrCode()
{
var str = "IT大师www.itdos.com";
var result = new HttpResponseMessage(HttpStatusCode.OK)
{
Content = new StringContent(str, Encoding.UTF8, "text/plain")
};
return result;
}