c# - 通过 MVVM 客户端查看和操作 MVC Web 应用程序的模型

Question

我正在构建一个 MVC 网络应用程序，它将通过 WPF native 客户端独占访问。由于我现在设法让这两个应用程序正常通信，我现在想知道如何在我的客户端中正确查看和操作来自 MVC 模型的对象。

在服务器端，我有(除其他外)两个类 Application 和 Category，这些类被配置为具有多对多基数:

public class Application
{
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int ApplicationID { get; set; }
    public ICollection<Category> AppCategories { get; set; }
}

public class Category
{
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int CategoryID { get; set; }
    public ICollection<Application> AssignedApps { get; set; }
}

我的客户端应用程序可以通过 webapi Controller 执行所有基本的 CRUD 操作，但我想知道如何正确地执行操作。

假设我想显示我所有的类别，并且他们分配的应用程序是以下方法好吧还是有更好的 war 来做这件事？

public async void GetCategoryList()
{

    Categories.Clear();

    List<Model.Category> model = null;
    try
    {
        AuthenticationResult result = null;
        result = authContext.AcquireToken(AppServiceResourceId, clientId, redirectUri, PromptBehavior.Never);

        httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", result.AccessToken);

        HttpResponseMessage response = await httpClient.GetAsync(AppServiceBaseAddress + "/api/CategoriesWebApi");

        if (response.IsSuccessStatusCode)
        {
            var jsonString = await response.Content.ReadAsStringAsync();
            model = JsonConvert.DeserializeObject<List<Model.Category>>(jsonString);

            foreach (var cat in model)
            {
                var currentCategory = new Category();
                currentCategory.CategoryID = cat.CategoryID;
                currentCategory.Description = cat.Description;
                foreach (var item in cat.AssignedCIs)
                {
                    currentCategory.AssignedCIs.Add(item);
                }

                Categories.Add(cat);

            }
        }
    }
}

感谢任何建议/最佳实践!

Answer 1

通过一些评论查看重构

//DON'T USE ASYNC/AWAIT WITH VOID NO NO NO NO NO NO
//USE TASK
public async Task GetCategoryList() {
    try {
        AuthenticationResult result = authContext.AcquireToken(AppServiceResourceId, clientId, redirectUri, PromptBehavior.Never);
        var httpClient = new HttpClient();
        httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", result.AccessToken);
        //make call to web api and get response
        var response = await httpClient.GetAsync(AppServiceBaseAddress + "/api/CategoriesWebApi");
        //check to make sure there is something to read
        if (response.IsSuccessStatusCode && response.Content.Headers.ContentLength.GetValueOrDefault() > 0) {
            var jsonString = await response.Content.ReadAsStringAsync();
            var model = JsonConvert.DeserializeObject<List<Model.Category>>(jsonString);
            //check to make sure model was deserialized properly and has items
            if(model != null && model.Count > 0) {
                //shouldn't clear till you have something to replace it with
                Categories.Clear();
                foreach (var cat in model) {
                    var currentCategory = new Category();
                    currentCategory.CategoryID = cat.CategoryID;
                    currentCategory.Description = cat.Description;
                    foreach (var item in cat.AssignedCIs) {
                        currentCategory.AssignedCIs.Add(item);
                    }
                    Categories.Add(currentCategory);
                }
            }
        } 
    } catch { //Notify User/UI of error }
}