c# - AngularJS $resource 在 Web Api 中搜索项目的工作示例

Question

我正在学习如何使用 AngularJS 的 $resource 调用 Web Api 后端。我想将对象层次结构作为标准传递并取回 IEnumerable<Program> .以下是标准示例:

$scope.criteria = {
    Categories:[
        {
            Name: "Cat1",
            Options: [
                {Text: "Opt1", Value: true},
                {Text: "Opt2", Value: false}
            ]
        },
        {
            Name: "Cat2",
            Options: [
                {Text: "Opt3", Value: true},
                {Text: "Opt4", Value: false}
            ]
        }
    ]
}

我在服务器上用 C# 定义了相同的对象。

public class CriteriaModel
{
   public IEnumerable<CriteriaCategory> Categories { get; set; }
}

public class CriteriaCategory
{
    public string Name { get; set; }
    public IEnumerable<CriteriaOption> Options { get; set; }
}

public class CriteriaOption
{
    public string Text { get; set; }
    public bool Value { get; set; }
}

这是我配置 $resource 的方式:

angular.module('my.services')
    .factory('api', [
        '$resource',
        function ($resource) {
            return {
                Profile: $resource('/api/profile/:id', { id: '@id' }),
                Settings: $resource('/api/settings/:id', { id: '@id' }),
                Program: $resource('/api/program/:id', { id: '@id' })
            };
        }
    ]);

我这样调用它:

api.Program.query({ criteria: $scope.criteria }, function (response) {
    $scope.programs = response;
});

无论我尝试什么，我要么得到 null作为条件参数或操作根本不执行。我不知道问题出在 Angular 、网络 API 还是两者都有。这是操作:

public class ProgramController : ApiController
{
    public IEnumerable<Program> GetByCriteria([FromUri]CriteriaModel criteria)
    {
        // Either criteria is null or this action doesn't even get
        // executed depending on what I try.
    }
}

谁能帮我找到一个使用 AngularJS $resource 和 Web Api 搜索和返回项目的工作示例？

Answer 1

您将需要一个自定义模型 Binder 。来自 what I understand FromUri 不会处理 $resource 将放入查询字符串中的复杂嵌套类型或 json。

模型 Binder :

public class CriteriaModelBinder : IModelBinder
{
    public bool BindModel(
        HttpActionContext actionContext,
        ModelBindingContext bindingContext
    )
    {
        if (bindingContext.ModelType != typeof (CriteriaModel))
        {
            return false;
        }

        var value = bindingContext.ValueProvider.GetValue("Categories");

        if (value == null)
        {
            return false;
        }

        var categoryJson = value.RawValue as IEnumerable<string>;

        if (categoryJson == null)
        {
            bindingContext.ModelState.AddModelError(
                bindingContext.ModelName, "Categories cannot be null.");
            return false;
        }
        
        var categories = categoryJson
            .Select(JsonConvert.DeserializeObject<CriteriaCategory>)
            .ToList();

        bindingContext.Model = new CriteriaModel {Categories = categories};
        return true;
    }
}

Controller :

[RoutePrefix("api/program")]
public class ProgramController : ApiController
{
    [Route("getbycriteria")]
    [HttpGet]
    public HttpResponseMessage GetByCriteria(
        [ModelBinder(typeof(CriteriaModelBinder))]CriteriaModel criteria
    )
    {
        return new HttpResponseMessage(HttpStatusCode.OK);
    }
}

Angular Controller :

angular.module('myApp').
    controller('HomeController', function($scope, $resource) {
        var Program = $resource('/api/program/:id', {}, {
            getByCriteria: {
                url: '/api/program/getbycriteria',
                method: 'GET',
                isArray: true
            }
        });

        var program = new Program();
        var criteria = {
            Categories: [
                {
                    Name: "Cat1",
                    Options: [
                        { Text: "Opt1", Value: true },
                        { Text: "Opt2", Value: false }
                    ]
                },
                {
                    Name: "Cat2",
                    Options: [
                        { Text: "Opt3", Value: true },
                        { Text: "Opt4", Value: false }
                    ]
                }
            ]
        };

        $scope.submit = function () {
            console.log(program);
            program.$getByCriteria(criteria);
        };
    });

编辑:

这里是POST:

Controller :

[RoutePrefix("api/program")]
public class ProgramController : ApiController
{
    [Route("getbycriteria")]
    [HttpPost]
    public HttpResponseMessage GetByCriteria(CriteriaModel criteria)
    {
        return new HttpResponseMessage(HttpStatusCode.OK);
    }
}

Angular :

angular.module('myApp').
    controller('HomeController', function($scope, $resource) {
        var Program = $resource('/api/program/:id', {}, {
            getByCriteria: {
                url: '/api/program/getbycriteria',
                method: 'POST',
                isArray: true
            }
        });

        var program = new Program();
        program.Categories = [
                {
                    Name: "Cat1",
                    Options: [
                        { Text: "Opt1", Value: true },
                        { Text: "Opt2", Value: false }
                    ]
                },
                {
                    Name: "Cat2",
                    Options: [
                        { Text: "Opt3", Value: true },
                        { Text: "Opt4", Value: false }
                    ]
                }
            ];

        $scope.submit = function () {
            console.log(program);
            program.$getByCriteria();
        };
    });