c# – Web Api中AngularJS $资源搜索项的工作示例

发布时间：2020-12-15 04:33:41 所属栏目：百科来源：网络整理

导读：我正在学习如何使用AngularJS的$资源来调用Web Api后端.我想在标准中传递对象层次结构并返回IEnumerable Program.以下是标准的示例： $scope.criteria = { Categories:[ { Name: "Cat1",Options: [ {Text: "Opt1",Value: true},{Text: "Opt2",Value: false}

我正在学习如何使用AngularJS的$资源来调用Web Api后端.我想在标准中传递对象层次结构并返回IEnumerable< Program>.以下是标准的示例：

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

我在C#中的服务器上定义了相同的对象.

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; }
}

这是我如何配置$resource：

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

我称之为：

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

无论我尝试什么,我都会得到null作为条件参数或者动作根本不执行.我不知道问题是在角度,web api,还是两者兼而有之.这是行动：

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.
    }
}

有人可以帮助我使用AngularJS $resource和Web Api获取搜索和返回项目的工作示例吗？

解决方法

您将需要一个自定义模型绑定器.从 what I understand起,FromUri将不会处理复杂的嵌套类型或json,其中$resource将放入查询字符串中.

Github Sample

型号粘合剂：

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;
    }
}

控制器：

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

角度控制器：

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",{ Text: "Opt4",Value: false }
                    ]
                }
            ]
        };

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

编辑：

这是POST：

控制器：

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

角度：

angular.module('myApp').
    controller('HomeController',method: 'POST',isArray: true
            }
        });

        var program = new Program();
        program.Categories = [
                {
                    Name: "Cat1",Value: false }
                    ]
                }
            ];

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

（编辑：李大同）

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