我正在尝试以C#中的string
形式获取POST请求正文。我写了这个:
protected async Task<string> readBodyAsync(HttpRequest req)
{
// turns out this is always false...
if(req.Body.CanSeek)
req.Body.Seek(0, SeekOrigin.Begin);
// string buffer
string str = "";
// I wouldn't expect to have to do this in 2017
byte[] buffer = new byte[255];
int offset = 0;
int lastLen = 0;
// On second iteration, CanRead is true but ReadAsync throws System.ArgumentException
while ( req.Body.CanRead && (lastLen = await req.Body.ReadAsync(buffer, offset, buffer.Length))!=0)
{
offset += lastLen;
// This also adds all the \0 characters from the byte buffer, instead of treating like
// normal C string
str += System.Text.Encoding.UTF8.GetString(buffer);
}
// This never executes due to the System.ArgumentException
return str;
}
问题:
req.Body.CanRead
是true
,但是调用read会导致System.ArgumentException
System.Text.Encoding.UTF8.GetString
将缓冲区中所有剩余的零添加到字符串中。 我这样处理请求:
app.Run(async (context) =>
{
if(context.Request.Method.ToLower() == "post" && context.Request.Path.ToString().EndsWith("/ajax"))
{
string requestText = await readBodyAsync(context.Request);
/// Parsing of the JSON in requestText should be here
// but I can't get that text
await context.Response.WriteAsync("{data: \"AJAX TEST\"}");
}
else
{
await context.Response.WriteAsync("Hello World! And go away. Invalid request.");
}
});
最佳答案
private async Task<string> StreamToStringAsync(HttpRequest request)
{
using (var sr = new StreamReader(request.Body))
{
return await sr.ReadToEndAsync();
}
}