What’s Custard?

Custard is a .NET standard plugin to call web APIs intuitively. 😁

Fully compatible with:

• .NET MAUI
• Xamarin Forms

Documentation 📄

Installation

• Package manager

  Install-Package Custard -Version 0.3.7
  

• .NET CLI

  dotnet add package Custard --version 0.3.7
  

  Custard.Service

• Instantiate a service object:

Service yourService = new Service(string host, int port = 80, bool sslCertificate = false); 

• Create headers

  yourService.RequestHeaders.Add("Hearder", "Value "); // Do this for every headers
  

  ⚠ For every method below, we recommend being very explicit with your parameters. As there are too many options for parameters, this could lead to ambiguities.

  e.g: use Get(controller: theController) instead of Get(theController)

• Call a POST method

  Parameters:

  Name	Type	Required
  controller	string	✔
  action	string	❌
  headers	IDictionary<string, string>	❌
  jsonBody	string	❌
  parameters	string[] / IDictonary<string,string>	❌

  Usage:

  • To return a string:

    yourService.Post (controller: controller,
                      action: action,
                      singleUseHeaders: headers,
                      jsonBody: jsonBody,
                      parameters: parameters);
    

  • To return a model (T is the model):

    yourService.Post<T> (controller: controller,
                         action: action,
                         singleUseHeaders: headers,
                         jsonBody: jsonBody,
                         parameters: parameters);
    

• Call a PUT method

  Parameters:

  Name	Type	Required
  controller	string	✔
  action	string	❌
  headers	IDictionary<string, string>	❌
  jsonBody	string	❌
  parameters	string[] / IDictonary<string,string>	❌

  Usage:

  • To return a string:

    yourService.Put (controller: controller,
                     action: action,
                     singleUseHeaders: headers,
                     jsonBody: jsonBody,
                     parameters: parameters);
    

  • To return a model (T is the model):

    yourService.Put<T> (controller: controller,
                        action: action,
                        singleUseHeaders: headers,
                        jsonBody: jsonBody,
                        parameters: parameters);
    

• Call a GET method

  Parameters:

  Name	Type	Required
  controller	string	✔
  action	string	❌
  headers	IDictionary<string, string>	❌
  jsonBody	string	❌
  parameters	string[] / IDictonary<string,string>	❌

  Usage:

  • To return a string:

    yourService.Get (controller: controller,
                   action: action,
                   singleUseHeaders: headers,
                   jsonBody: jsonBody,
                   parameters: parameters);
    

  • To return a model (T is the model):

    yourService.Get<T> (controller: controller,
                      action: action,
                      singleUseHeaders: headers,
                      jsonBody: jsonBody,
                      parameters: parameters);
    

Passing Parameters to your requests

Custard now supports two types of parameters:

• Path parameters
• Query parameters

Path parameters

To pass path parameters to your requests, you have to pass them as string[]:

E.g: for /users/api/2/3/4 we would use:

string action = "users";
string controller = "api";
string[] param = { "2", "3", "4" };
           
var resultStr = await yourService.Get(controller: controller,
                                      action: action,
                                      parameters: param);

Query parameters

To pass query parameters to your requests, you have to pass them as Dictionary<string, string>:

E.g: for /users/api?two=2&three=3&four=4 we would use:

string action = "users";
string controller = "api";

Dictionary<string, string> param = new Dictionary<string, string>
{
    { "two", "2" },
    { "three", "3" },
    { "four", "4" }
};
           
var resultStr = await yourService.Get(controller: controller,
                                      action: action,
                                      parameters: param);

⚠ If you want to return a model, the HTTP response body has to be in JSON format

Cancellation Token

From v0.3.5, you can now add a cancellation token to you request.

using CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
var cancelationToken = cancellationTokenSource.Token;
//

// Act
Task task =  _wService.Get(controller: controller,
                                cancellationToken: cancelationToken);

• Callback Error

  If needed, you can add a callback if the request faces an HTTP error. This will work with any method mentioned above. This will allow you to do an handle the error more easily. Here’s how it works:

  var actualResult = await yourService.Get(controller: "todolists",
                                           singleUseHeader: headers,
                                           callbackError: (err) => 
            {
                  
            });
  

  • code: the error status code (HttpStatusCode).