Making a cURL call in C#
Solution 1:
Well, you wouldn't call cURL directly, rather, you'd use one of the following options:
-
HttpWebRequest/HttpWebResponse WebClient-
HttpClient(available from .NET 4.5 on)
I'd highly recommend using the HttpClient class, as it's engineered to be much better (from a usability standpoint) than the former two.
In your case, you would do this:
using System.Net.Http;
var client = new HttpClient();
// Create the HttpContent for the form to be posted.
var requestContent = new FormUrlEncodedContent(new [] {
new KeyValuePair<string, string>("text", "This is a block of text"),
});
// Get the response.
HttpResponseMessage response = await client.PostAsync(
"http://api.repustate.com/v2/demokey/score.json",
requestContent);
// Get the response content.
HttpContent responseContent = response.Content;
// Get the stream of the content.
using (var reader = new StreamReader(await responseContent.ReadAsStreamAsync()))
{
// Write the output.
Console.WriteLine(await reader.ReadToEndAsync());
}
Also note that the HttpClient class has much better support for handling different response types, and better support for asynchronous operations (and the cancellation of them) over the previously mentioned options.
Solution 2:
Or in restSharp:
var client = new RestClient("https://example.com/?urlparam=true");
var request = new RestRequest(Method.POST);
request.AddHeader("content-type", "application/x-www-form-urlencoded");
request.AddHeader("cache-control", "no-cache");
request.AddHeader("header1", "headerval");
request.AddParameter("application/x-www-form-urlencoded", "bodykey=bodyval", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
Solution 3:
Below is a working example code.
Please note you need to add a reference to Newtonsoft.Json.Linq
string url = "https://yourAPIurl";
WebRequest myReq = WebRequest.Create(url);
string credentials = "xxxxxxxxxxxxxxxxxxxxxxxx:yyyyyyyyyyyyyyyyyyyyyyyyyyyyyy";
CredentialCache mycache = new CredentialCache();
myReq.Headers["Authorization"] = "Basic " + Convert.ToBase64String(Encoding.ASCII.GetBytes(credentials));
WebResponse wr = myReq.GetResponse();
Stream receiveStream = wr.GetResponseStream();
StreamReader reader = new StreamReader(receiveStream, Encoding.UTF8);
string content = reader.ReadToEnd();
Console.WriteLine(content);
var json = "[" + content + "]"; // change this to array
var objects = JArray.Parse(json); // parse as array
foreach (JObject o in objects.Children<JObject>())
{
foreach (JProperty p in o.Properties())
{
string name = p.Name;
string value = p.Value.ToString();
Console.Write(name + ": " + value);
}
}
Console.ReadLine();
Reference: TheDeveloperBlog.com
Solution 4:
Late response but this is what I ended up doing. If you want to run your curl commands very similarly as you run them on linux and you have windows 10 or latter do this:
public static string ExecuteCurl(string curlCommand, int timeoutInSeconds=60)
{
if (string.IsNullOrEmpty(curlCommand))
return "";
curlCommand = curlCommand.Trim();
// remove the curl keworkd
if (curlCommand.StartsWith("curl"))
{
curlCommand = curlCommand.Substring("curl".Length).Trim();
}
// this code only works on windows 10 or higher
{
curlCommand = curlCommand.Replace("--compressed", "");
// windows 10 should contain this file
var fullPath = System.IO.Path.Combine(Environment.SystemDirectory, "curl.exe");
if (System.IO.File.Exists(fullPath) == false)
{
if (Debugger.IsAttached) { Debugger.Break(); }
throw new Exception("Windows 10 or higher is required to run this application");
}
// on windows ' are not supported. For example: curl 'http://ublux.com' does not work and it needs to be replaced to curl "http://ublux.com"
List<string> parameters = new List<string>();
// separate parameters to escape quotes
try
{
Queue<char> q = new Queue<char>();
foreach (var c in curlCommand.ToCharArray())
{
q.Enqueue(c);
}
StringBuilder currentParameter = new StringBuilder();
void insertParameter()
{
var temp = currentParameter.ToString().Trim();
if (string.IsNullOrEmpty(temp) == false)
{
parameters.Add(temp);
}
currentParameter.Clear();
}
while (true)
{
if (q.Count == 0)
{
insertParameter();
break;
}
char x = q.Dequeue();
if (x == '\'')
{
insertParameter();
// add until we find last '
while (true)
{
x = q.Dequeue();
// if next 2 characetrs are \'
if (x == '\\' && q.Count > 0 && q.Peek() == '\'')
{
currentParameter.Append('\'');
q.Dequeue();
continue;
}
if (x == '\'')
{
insertParameter();
break;
}
currentParameter.Append(x);
}
}
else if (x == '"')
{
insertParameter();
// add until we find last "
while (true)
{
x = q.Dequeue();
// if next 2 characetrs are \"
if (x == '\\' && q.Count > 0 && q.Peek() == '"')
{
currentParameter.Append('"');
q.Dequeue();
continue;
}
if (x == '"')
{
insertParameter();
break;
}
currentParameter.Append(x);
}
}
else
{
currentParameter.Append(x);
}
}
}
catch
{
if (Debugger.IsAttached) { Debugger.Break(); }
throw new Exception("Invalid curl command");
}
StringBuilder finalCommand = new StringBuilder();
foreach (var p in parameters)
{
if (p.StartsWith("-"))
{
finalCommand.Append(p);
finalCommand.Append(" ");
continue;
}
var temp = p;
if (temp.Contains("\""))
{
temp = temp.Replace("\"", "\\\"");
}
if (temp.Contains("'"))
{
temp = temp.Replace("'", "\\'");
}
finalCommand.Append($"\"{temp}\"");
finalCommand.Append(" ");
}
using (var proc = new Process
{
StartInfo = new ProcessStartInfo
{
FileName = "curl.exe",
Arguments = finalCommand.ToString(),
UseShellExecute = false,
RedirectStandardOutput = true,
RedirectStandardError = true,
CreateNoWindow = true,
WorkingDirectory = Environment.SystemDirectory
}
})
{
proc.Start();
proc.WaitForExit(timeoutInSeconds*1000);
return proc.StandardOutput.ReadToEnd();
}
}
}
The reason why the code is a little bit long is because windows will give you an error if you execute a single quote. In other words, the command curl 'https://google.com' will work on linux and it will not work on windows. Thanks to that method I created you can use single quotes and run your curl commands exactly as you run them on linux. This code also checks for escaping characters such as \' and \".
For example use this code as
var output = ExecuteCurl(@"curl 'https://google.com' -H 'Accept: application/json, text/javascript, */*; q=0.01'");
If you where to run that same string agains C:\Windows\System32\curl.exe it will not work because for some reason windows does not like single quotes.
Solution 5:
I know this is a very old question but I post this solution in case it helps somebody. I recently met this problem and google led me here. The answer here helps me to understand the problem but there are still issues due to my parameter combination. What eventually solves my problem is curl to C# converter. It is a very powerful tool and supports most of the parameters for Curl. The code it generates is almost immediately runnable.