ASP.NET WebApi框架异步实现MultipartContent方式上传文件-开发框架文库

ASP.NET WebApi框架异步实现MultipartContent方式上传文件

ASP.NET WebApi框架异步实现MultipartContent方式上传文件，功能特点：

1. 接口采用异步(Async)方式。

2. 接口支持数据签名。

WebApi服务端接口设计：

C# Code:

/// <summary>
/// 使用MultipartFormData上传文件，支持多个文件上传.
/// 路由格式:http://localhost:8888/user/file/upload
/// </summary>
/// <returns></returns>
[HttpPost]
[ActionName("upload")]
public async Task<ModelResponse> Upload()
{
//判断内容类型是否MimeMultipartContent
if (!this.Request.Content.IsMimeMultipartContent())
return new ModelResponse { Code = -1, Message = "无效的媒体类型(必须为MimeMultipartContent)" };

//获取Request.Headers头部信息
string apikey = GetHeaderValue(this.Request.Headers, "apikey");
string bucket = GetHeaderValue(this.Request.Headers, "bucket");
string sign = GetHeaderValue(this.Request.Headers, "sign");
string ts = GetHeaderValue(this.Request.Headers, "ts");

//检查参数
if (String.IsNullOrEmpty(bucket) || String.IsNullOrEmpty(apikey) || String.IsNullOrEmpty(sign))
return new ModelResponse { Code = ErrorCodes.InvalidParameter, Message = ErrorCodes.InvalidParameter_Msg };

//检查通过，执行逻辑处理。。。。

//省略代码。。。。

}

//来源:C/S框架网 | www.csframework.com | QQ:23404761

客户端测试接口：

C# Code:

/// <summary>
/// 上传文件
/// URL格式：http://localhost:19893/user/file/upload
/// </summary>
/// <param name="bucket">文件根目录名</param>
/// <param name="fileList">文件清单</param>
/// <param name="headers">提交的Request.Headers数据</param>
/// <returns></returns>
public ModelResponse Upload(string bucket, List<string> fileList, NameValueCollection headers)
{
if (headers == null) headers = new NameValueCollection();

string ts = DateTime.Now.ToString("yyyyMMddHHmmss");

//传公钥及数据签名
headers.Add("apikey", _apikey);
headers.Add("bucket", bucket);
headers.Add("ts", ts);
headers.Add("sign", CryptoHelper.ToMD5(_apikey + bucket + _secretKey + ts));

using (HttpClient client = new HttpClient())
{
client.Timeout = new TimeSpan(0, 10, 0);//10分钟
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("text/json"));//响应数据格式

//multipart/form-data的方式上传数据
using (var content = new MultipartFormDataContent())
{
AddToHeader(content, headers);//添加FormData
AddToContent(content, this.GetFileByteArrayContent(fileList));//添加文件数据

try
{
HttpResponseMessage result = client.PostAsync(_urlBase, content).Result;//post请求
if (result.IsSuccessStatusCode)
{
string json = result.Content.ReadAsStringAsync().Result;//将响应结果显示在文本框内
return JsonConvert.DeserializeObject<ModelResponse>(json);
}
else
{
return new ModelResponse { Code = -1, Message = result.Content.ReadAsStringAsync().Result };
}
}
catch (Exception ex)
{
return new ModelResponse { Code = -1, Message = ex.ToString() };
}
}
}
}

//来源:C/S框架网 | www.csframework.com | QQ:23404761

C# Code:

/// <summary>
/// 添加头部信息
/// </summary>
/// <param name="content"></param>
/// <param name="headers"></param>
private void AddToHeader(MultipartFormDataContent content, NameValueCollection headers)
{
foreach (string item in headers.Keys)
{
content.Headers.Add(item, headers[item]);
}
}

C# Code:

/// <summary>
/// 添加内容
/// </summary>
/// <param name="content"></param>
/// <param name="dataContents"></param>
private void AddToContent(MultipartFormDataContent content, List<ByteArrayContent> dataContents)
{
foreach (var byteArrayContent in dataContents)
{
content.Add(byteArrayContent);
}
}

C# Code:

/// <summary>
/// 获取文件集合对应的ByteArrayContent集合
/// </summary>
/// <param name="files">文件清单</param>
/// <returns></returns>
private List<ByteArrayContent> GetFileByteArrayContent(List<string> files)
{
List<ByteArrayContent> list = new List<ByteArrayContent>();
foreach (var file in files)
{
var fileContent = new ByteArrayContent(File.ReadAllBytes(file));
fileContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
{
FileName = Path.GetFileName(file)
};
list.Add(fileContent);
}
return list;
}

C# Code:

/// <summary>
/// 获取键值集合对应的ByteArrayContent集合
/// </summary>
/// <param name="collection"></param>
/// <returns></returns>
private List<ByteArrayContent> GetFormDataByteArrayContent(NameValueCollection collection)
{
List<ByteArrayContent> list = new List<ByteArrayContent>();
foreach (var key in collection.AllKeys)
{
var dataContent = new ByteArrayContent(Encoding.UTF8.GetBytes(collection[key]));
dataContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
{
Name = key
};
list.Add(dataContent);
}
return list;
}

//来源:C/S框架网 | www.csframework.com | QQ:23404761