1.配置环境

项目中引用 QiNiu.4.0.dll

在webconfig:
<add key="USER_AGENT" value="qiniu csharp-sdk v6.0.0"/>
<add key="ACCESS_KEY" value=""/>//账号 ---> 密钥AK
<add key="SECRET_KEY" value=""/>//账号 ---> 密钥SK
<add key="RS_HOST" value="http://rs.Qbox.me"/>
<add key="UP_HOST" value="http://up.qiniu.com"/>
<add key="RSF_HOST" value="http://rsf.Qbox.me"/>
<add key="PREFETCH_HOST" value="http://iovip.qbox.me"/>
<add key="API_HOST" value="http://api.qiniu.com"/>

2.创建七牛文件的实体类
  public class QiNiuFile{
            public string fileUrl { get; set; }
            public string fileKey { get; set; }
            public string fileMime { get; set; }
            public string fileThumbnailUrl { get; set; }
        }

3.页 面Html 用的form 提交
<style type="text/css">
    .c-list {
        color: #000;
        margin: 0 0 0 10px;
    }

    .text-none {
        display: none;
    }

    .text-block {
        display: block;
    }

    .td1 {
        background-color: Silver;
    }

    .inputFile
    {
        display:none;
    }

    .opacity
    {
        filter:alpha(opacity=50); /*IE滤镜，透明度50%*/
        -moz-opacity:0.5; /*Firefox私有，透明度50%*/
        opacity:0.5; /*其他，透明度50%*/
    }

    #fileList .file
    {
        margin: 10px;
        width: 80px;
        height: 80px;
        float: left;
    }

     #fileList .file div
    {
       margin-left: auto;
       margin-right: auto;
    }

    #fileList .file .flieKey
    {
        width: 60px;
        height: 60px;
    }

     #fileList .file .flieKey img
    {
        width: 60px;
        height: 60px;
    }

     #fileList .file .fileName
    {
       text-align: center;
    }

    #loadSta
    {
        position:absolute;
        left:0px;
        top:0px;
        width:100%;
        height:100px;
        z-index:99;
        filter:alpha(opacity=50);
        vertical-align:middle;
        text-align:center;
        display:none;
    }
        #loadSta img
        {
            margin-top:200px;
        }

</style>
<form ,vframe,offset,width,height);

            string ThumbnailUrl = GetFileUrl(fileKey, true, domain) + thumbnail;
            return ThumbnailUrl;
        }

        /// <summary>
        /// 初始化七牛,读取webconfig
        /// </summary>
        public static void InitQiniu()
        {
            Qiniu.Conf.Config.Init();
        }

    }
}