DevExpress使用教程：创建一个Angular Dashboard应用（Part 2）

DevExpress Universal拥有.NET开发需要的所有平台控件，包含600多个UI控件、报表平台、DevExpress Dashboard eXpressApp 框架、适用于 Visual Studio的CodeRush等一系列辅助工具。

重要提示：使用本教程需要熟悉React的基本概念和模式，要查看这些概念，请访问angular.io 。

Step 2. 创建服务器应用程序

创建一个自定义服务器应用程序来显示您的数据，请按以下步骤操作：

1. 在Visual Studio中，创建一个ASP.NET Core 3.1应用程序，选择 Empty template。

2. 创建将存储仪表板的App_Data / Dashboards文件夹。

3. 用以下代码替换Startup.cs文件的内容：

using DevExpress.AspNetCore;
using DevExpress.DashboardAspNetCore;
using DevExpress.DashboardCommon;
using DevExpress.DashboardWeb;
using DevExpress.DataAccess.Json;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.FileProviders;
using System;

namespace AspNetCoreDashboardBackend {
public class Startup {
public Startup(IConfiguration configuration, IWebHostEnvironment hostingEnvironment) {
Configuration = configuration;
FileProvider = hostingEnvironment.ContentRootFileProvider;
}

public IConfiguration Configuration { get; }
public IFileProvider FileProvider { get; }

public void ConfigureServices(IServiceCollection services) {
services
// Configures CORS policies. 
.AddCors(options => {
options.AddPolicy("CorsPolicy", builder => {
builder.AllowAnyOrigin();
builder.AllowAnyMethod();
builder.WithHeaders("Content-Type");
});
})
// Adds the DevExpress middleware.
.AddDevExpressControls()
// Adds controllers.
.AddControllers()
// Configures the dashboard backend.
.AddDefaultDashboardController(configurator => {
configurator.SetDashboardStorage(new DashboardFileStorage(FileProvider.GetFileInfo("App_Data/Dashboards").PhysicalPath));
configurator.SetDataSourceStorage(CreateDataSourceStorage());
configurator.ConfigureDataConnection += Configurator_ConfigureDataConnection;
});
}

public void Configure(IApplicationBuilder app, IWebHostEnvironment env) {
// Registers the DevExpress middleware. 
app.UseDevExpressControls();
// Registers routing.
app.UseRouting();
// Registers CORS policies.
app.UseCors("CorsPolicy");
app.UseEndpoints(endpoints => {
// Maps the dashboard route.
EndpointRouteBuilderExtension.MapDashboardRoute(endpoints, "api/dashboard");
// Requires CORS policies.
endpoints.MapControllers().RequireCors("CorsPolicy");
});
}
public DataSourceInMemoryStorage CreateDataSourceStorage() {
DataSourceInMemoryStorage dataSourceStorage = new DataSourceInMemoryStorage(); 
DashboardJsonDataSource jsonDataSource = new DashboardJsonDataSource("Customers");
jsonDataSource.RootElement = "Customers";
dataSourceStorage.RegisterDataSource("jsonDataSourceSupport", jsonDataSource.SaveToXml());
return dataSourceStorage;
}
private void Configurator_ConfigureDataConnection(object sender, ConfigureDataConnectionWebEventArgs e) {
if (e.DataSourceName.Contains("Customers")) {
Uri fileUri = new Uri("https://raw.githubusercontent.com/DevExpress-Examples/DataSources/master/JSON/customers.json");
JsonSourceConnectionParameters jsonParams = new JsonSourceConnectionParameters();
jsonParams.JsonSource = new UriJsonSource(fileUri);
e.ConnectionParameters = jsonParams; 
}
}
}
}

4. 运行以下命令来启动服务器：

cmd

dotnet run

5. 要在客户端应用程序中使用此服务器，请跳转到app.component.html文件。将以下URL设置为端点：http：// localhost：5000 / api / dashboard

html

<dx-dashboard-control 
style="display: block;width:100%;height:800px;" 
endpoint='http://localhost:5000/api/dashboard'>
</dx-dashboard-control>

Step 3. 切换到Viewer模式

创建并保存仪表板后，您可以将仪表板设计器切换到Viewer模式。

1. 打开app.component.html文件，并将 workingMode属性设置为ViewerOnly：

html

<dx-dashboard-control 
style="display: block;width:100%;height:800px;"
endpoint='http://localhost:5000/api/dashboard'
workingMode='ViewerOnly'>
</dx-dashboard-control>

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