在ASP.NET Core Blazor WebAssembly应用程序中，当您尝试使用FetchData组件与SQL Server数据库通信时会遇到一些问题。具体来说，您可能会遇到无法从数据库获取数据的情况。

此问题是由于组件中的使用了默认情况下不支持远程请求的HttpClient。为了解决这个问题，您应该使用一个HttpClientHandler。以下代码示例显示如何配置Teleport.HttpClientHandler：

在程序包管理器控制台中安装Teleport.HttpClientHandler：

Install-Package Teleport.HttpClientHandler -Version 1.2.1

在FetchData.razor文件中添加以下代码：

@page "/fetchdata"
@using System.Net.Http
@using System.Collections.Generic
@using System.Threading.Tasks
@using Microsoft.AspNetCore.Components
@using Newtonsoft.Json
@using Teleport.HttpClientHandler
 
Weather forecast
 
This component demonstrates fetching data from the server and displaying it.
 
@if (forecasts == null)
{
    
Loading...
}
else
{
    
            @foreach (var forecast in forecasts)
            {
                
            }
        

        

            

                
Date
                
Temp. (C)
                
Temp. (F)
                
Summary
            
        
        

                    
@forecast.Date.ToShortDateString()
                    
@forecast.TemperatureC
                    
@forecast.TemperatureF
                    
@forecast.Summary
                
    
}
 
@code {
    private WeatherForecast[] forecasts;
    private HttpClient httpClient;
 
    protected override async Task OnInitializedAsync()
    {
        await base.OnInitializedAsync();
 
        var handler = new TeleportHandler();
        httpClient = new HttpClient(handler)
        {
            BaseAddress = new Uri("https://localhost:44374")
        };
 
        forecasts = await httpClient.GetJson