小试Blazor——实现Ant Design Blazor动态表单

前言

最近想了解下Blazor,于是尝试使用Blazor写一个简单的低代码框架,于是就采用了Ant Design Blazor作为组件库

低代码框架在表现层的第一步则是动态表单,需要将设计时的结构渲染成运行时的表单,本次主要实现动态表单,相关数据接口都以返回固定数据的形式实现

实现

1.项目准备

先通过命令创建一个Ant Design Blazor项目,并加入到空的解决方案当中:

dotnet new antdesign -o LowCode.Web -ho server

 

由于我们需要写一些API接口,所以在Startup类中加入控制器相关的代码:

 

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddRazorPages();
            services.AddControllers();//添加控制器
            services.AddEndpointsApiExplorer();

            services.AddServerSideBlazor();
            services.AddAntDesign();
            services.AddScoped(sp => new HttpClient
            {
                BaseAddress = new Uri(sp.GetService<NavigationManager>().BaseUri)
            });
            services.Configure<ProSettings>(Configuration.GetSection("ProSettings"));
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Error");
                // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
                app.UseHsts();
            }

            app.UseHttpsRedirection();
            app.UseStaticFiles();
            
            app.UseRouting();
            
            app.UseEndpoints(endpoints =>
            {
                endpoints.MapBlazorHub();
                endpoints.MapFallbackToPage("/_Host");
                endpoints.MapControllers();//配置控制器
            });
        }

 

  

2.菜单接口

在项目中新增Services文件夹,添加MenuServices类并填入固定数据,并在Startup类中注册:

 

    public class MenuService
    {
        /// <summary>
        /// 获取左侧导航数据
        /// </summary>
        /// <returns></returns>
        public virtual MenuDataItem[] GetMenuData()
        {
            return new MenuDataItem[]
            {
                new MenuDataItem
                {
                    Path="/",
                    Name="测试模块",
                    Key="Test",
                    Icon="smile",
                    Children=new MenuDataItem[]
                    {
                        new MenuDataItem
                        {
                            Path="/StdForm",
                            Name="动态表单",
                            Key="Form",
                            Icon="plus-square"
                        }
                    }
                }
            };
        }
    }

 

修改BaseicLayout.razor中@code部分,将_menuData改为从MenuService中获取:

 

    private MenuDataItem[] _menuData ;
    [Inject] public MenuService MenuService { get; set; }

    protected override async Task OnInitializedAsync()
    {
        await base.OnInitializedAsync();
        _menuData = MenuService.GetMenuData();
    }

 

3.表单组件接口

创建一个简单的表单与组件的Model:

录入控件Input:

    public class Input 
    {
        public string Name { get; set; }
        public string Value { get; set; }
    }

 

标准表单StandardFormModel:

    public class StandardFormModel
    {
        public StandardFormModel()
        {
            ArrayInput = new List<Input>();
        }
        public List<Input> ArrayInput { get; set; }
    }

  

表单API接口FormController:

    [Route("api/[controller]/[action]")]
    [ApiController]
    public class FormController : ControllerBase
    {

        [HttpGet]
        public StandardFormModel GetFormStruc()
        {
            var result = new StandardFormModel();
            result.ArrayInput.AddRange(new List<Input>(){
                new Input()
                {
                    Name="账号"
                },
                new Input()
                {
                    Name="密码"
                }
            });
            return result;
        }
    }

  

4.动态表单页面

在Pages文件夹下创建一个StdForm.razor和StdForm.razor.cs文件

StdForm.razor.cs(注意partial):

    public partial class StdForm
    {
        public StandardFormModel StandardFormModel { get; set; }

        public Form<StandardFormModel> StdFormModel { get; set; }

        [Inject]
        public HttpClient HttpClient { get; set; }
     public void Init() { var formStruc = HttpClient.GetFromJsonAsync<StandardFormModel>("api/Form/GetFormStruc").Result; StandardFormModel= formStruc; } protected override async Task OnInitializedAsync() { Init(); await base.OnInitializedAsync(); } }

  

StdForm.razor:

@page "/StdForm"
<Form @ref="StdFormModel"
      Model="StandardFormModel"
    LabelColSpan="1"
    WrapperColSpan="6">

    @foreach (var item in StandardFormModel.ArrayInput)
    {
        <FormItem Label="@item.Name">

            @if (item is Model.Component.Input)
            {
                <Input @bind-Value="@item.Value"/>
            }

        </FormItem>
    }

</Form>

  

运行效果

 

总结

在Blazor项目中要访问API接口则需要注入HttpClient类,使用HttpClient请求API接口即可,也可以直接注入Services调用。

目前仅仅是验证了动态表单的可能性,其他的组件渲染可以根据Ant Design Blazor官方文档定义模型结构实现

参考文档:

Blazor官方文档

Ant Design Blazor官方文档

Ant Design Blazor仓库

posted @ 2023-06-24 22:25  梳墨呀  阅读(1625)  评论(0编辑  收藏  举报