C#.NET WebApi返回各种类型(图片/json数据/字符串)，.net图片转二进制流或byte

﹏ヽ暗。殇╰゛Y 2022-08-02 04:45 201阅读 0赞

原文：[http://www.itdos.com/Mvc/20150302/0741255.html][http_www.itdos.com_Mvc_20150302_0741255.html]

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;
    }

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