首先，以下方式是错误的（这个重复读取只能在using语句里面生效，因为用了ms对象赋值，当using结束后ms资源被释放，Request.Body就无法再读了）
[HttpPost]
public async Task<string> Post()
{
//StreamReader sr = new StreamReader(Request.Body);
//string data = await sr.ReadToEndAsync();
string data = "";
using (MemoryStream ms = new MemoryStream())
{
await Request.Body.CopyToAsync(ms);
//设置当前流的位置为0
ms.Seek(0, SeekOrigin.Begin);
logger.LogInformation("ms.Length=" + ms.Length);
//这里ReadToEnd执行完毕后requestBodyStream流的位置会从0到最后位置(即request.ContentLength)
data = new StreamReader(ms, Encoding.UTF8).ReadToEnd();
logger.LogInformation("data=" + data);
//设置当前流的位置为0
ms.Seek(0, SeekOrigin.Begin);
Request.Body = ms;
StreamReader sr = new StreamReader(Request.Body);
string data2 = await sr.ReadToEndAsync();
logger.LogInformation("data2=" + data2);
}
string header = $"请求头:\r\n";
foreach (var item in Request.Headers)
{
header += $"{item.Key}:{item.Value}\r\n";
}
logger.LogInformation(header);
var ip = Request.Headers["X-Forwarded-For"].FirstOrDefault();
if (string.IsNullOrEmpty(ip))
{
//ip = Request.HttpContext.Connection.RemoteIpAddress.ToString();
//ip = Request.HttpContext.Connection.LocalIpAddress.MapToIPv4().ToString();
ip = Request.HttpContext.Connection.RemoteIpAddress.MapToIPv4().ToString();
}
logger.LogInformation("ip=" + ip);
//...
}
正确方式是：
[HttpPost] public async Task<string> Post() { //StreamReader sr = new StreamReader(Request.Body); //string data = await sr.ReadToEndAsync(); string data = ""; //Request.EnableBuffering();可以实现多次读取Body Request.EnableBuffering(); StreamReader sr = new StreamReader(Request.Body); data = await sr.ReadToEndAsync(); logger.LogInformation("data=" + data); Request.Body.Seek(0, SeekOrigin.Begin); //再次读取 依然可以成功读到 Request.EnableBuffering(); StreamReader sr2 = new StreamReader(Request.Body); string data2 = await sr2.ReadToEndAsync(); logger.LogInformation("data2=" + data2); Request.Body.Seek(0, SeekOrigin.Begin); string header = $"请求头:\r\n"; foreach (var item in Request.Headers) { header += $"{item.Key}:{item.Value}\r\n"; } logger.LogInformation(header); var ip = Request.Headers["X-Forwarded-For"].FirstOrDefault(); if (string.IsNullOrEmpty(ip)) { //ip = Request.HttpContext.Connection.RemoteIpAddress.ToString(); //ip = Request.HttpContext.Connection.LocalIpAddress.MapToIPv4().ToString(); ip = Request.HttpContext.Connection.RemoteIpAddress.MapToIPv4().ToString(); } logger.LogInformation("ip=" + ip); //... }
Asp.NetCore3.1 asp.net 5.0 中多次读取 Request.Body Ajax Post过来的JSON数据等 已验证有效
原文：https://www.cnblogs.com/webenh/p/13111476.html