简单粗暴，直接上代码吧

//这是提交post的

public String GetImageStr(String imgFilePath)

{

//图片路径

string path = @"E:\MyProject\CommonHelp\WebApiDemo\img\1.jpg";

FileInfo file = new FileInfo(path);

var stream = file.OpenRead();

byte[] buffer = new byte[file.Length];

//读取图片字节流

stream.Read(buffer, 0, Convert.ToInt32(file.Length));

//将base64字符串保存到base64.txt文件中

StreamWriter sw = new StreamWriter(@"E:\MyProject\CommonHelp\WebApiDemo\img\base64.txt", false, Encoding.UTF8);

//将字节流转化成base64字符串

string base64=Convert.ToBase64String(buffer);

var request = (HttpWebRequest)WebRequest.Create("http://localhost:2349/api/UserApi/UploadHead");

var postData = "UserInfoId=94";

postData += "&Base64="+base64;

postData += "&SuffixType=jpg";

var data = Encoding.ASCII.GetBytes(postData);

request.Method = "POST";

request.ContentType = "application/x-www-form-urlencoded";

request.ContentLength = data.Length;

using (var streams = request.GetRequestStream())

{

streams.Write(data, 0, data.Length);

}

var response = (HttpWebResponse)request.GetResponse();

var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();

return responseString.ToString();

}

 

 

//这是接口提供方

public ImageDto UploadImage(UploadImageDto uploadImageDto)

{

uploadImageDto.Base64 = uploadImageDto.Base64.Replace(' ', '+');

string path = string.Format("/UploadImge/" + DateTime.Now.ToString("yyyyMMdd") + "/");

byte[] imgByte = Convert.FromBase64String(uploadImageDto.Base64);

MemoryStream ms = new MemoryStream(imgByte);

Image image = System.Drawing.Image.FromStream(ms);

string fileName = string.Format("{0}." + uploadImageDto.SuffixType, DateTime.Now.ToString("yyyyMMddhhmmssffff") + RandomHelper.GenerateCheckCodeNum(6));

string filePath = string.Format("{0}{1}", path, fileName);

string serverPath = HttpContext.Current.Server.MapPath("~" + path);

if (!Directory.Exists(serverPath))

{

Directory.CreateDirectory(serverPath);

}

//保存图片

image.Save(serverPath + fileName);

string ImageUrl = WebConfigHelper.GetAppSettingsInfo("ImageUrl");

int ImgInfoId = _baseImgInfoService.Insert(new BaseImgInfoEntity

{

CreateTime = DateTime.Now,

Path = filePath,

Title = "接口图片上传",

Type = 0,

Source = ImageUrl

});

return new ImageDto { ImageId = ImgInfoId, Source = ImageUrl, Path = filePath, Title = "接口图片上传" };

}

 

//注意！！！！这里必须把‘ ’空格替换成‘+’加号，具体情况未明

uploadImageDto.Base64 = uploadImageDto.Base64.Replace(' ', '+');

 

 

 

 

 

 

转换成Base64之后进行UrlEncode编码即可

string text = System.Web.HttpUtility.UrlEncode("heart", System.Text.Encoding.UTF8); //UrlEncode编码

string data = System.Web.HttpUtility.UrlDecode(text, System.Text.Encoding.UTF8); //UrlDecode解码