HttpClient PostAsync Invalid Post Format
I am trying to use HttpClient's PostAsync to login to a website; However it always fails and when I tracked the connection using WireShark I found that it posts the data incorrectly
Code
var content = new FormUrlEncodedContent(new[]
{
new KeyValuePair<string, string>("value1", data1),
new KeyValuePair<string, string>("value2", data2),
new KeyValuePair<string, string>("value3", data3)
});
or
var content = new List<KeyValuePair<string, string>>
{
new KeyValuePair<string, string>("value1", data1),
new KeyValuePair<string, string>("value2", data2),
new KeyValuePair<string, string>("value3", data3)
};
usage
httpClient.PostAsync(postUri, content)
Expectations
value1=123456&value2=123456&value3=123456
Reality
//It adds strange += which makes the post fail...
value1=123456&value2+=123456&value3+=123456
我知道这个作品：
var values = new List<KeyValuePair<string, string>>();
values.Add(new KeyValuePair<string, string>("Item1", "Value1"));
values.Add(new KeyValuePair<string, string>("Item2", "Value2"));
values.Add(new KeyValuePair<string, string>("Item3", "Value3"));
using (var content = new FormUrlEncodedContent(values))
{
client.PostAsync(postUri, content).Result)
}
Trim the parameters for possible whitespaces. Whitespaces result in a +
var content = new List<KeyValuePair<string, string>>
{
new KeyValuePair<string, string>("value1", data1.Trim()),
new KeyValuePair<string, string>("value2", data2.Trim()),
new KeyValuePair<string, string>("value3", data3.Trim())
};
in my opinion this is nicer to see:
var variables = new Dictionary<string, string>() {
{ "value1", value1 },
{ "value2", value2 }
};
var content = new FormUrlEncodedContent(variables);
and a dictionary can be useful to check for repeated values when loading it, unless you need repeated keys...
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