在配置方法startup.cs文件时出现错误。
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
else
{
app.UseHsts();
}
app.UseHttpsRedirection();
app.UseMvc();
app.UseSwagger();
app.UseSwaggerUI(c =>
{
c.SwaggerEndpoint("/swagger/v1/swagger.json", "Pets API V1");
});
**app.UseBlazor<PetsApp.Program>();**
}
错误：具有相同键的项目已添加
有人可以帮助我吗？
先谢谢您
答案 0 :(得分：2)
Blazor 0.7不能与.NET Core 2.2一起使用，也不能在.NET Core 2.2上工作，因为致力于该团队的团队专注于RazorComponents，后者将成为.Net Core 3.0的一部分。如果要使用Blazor 0.7，应在.Net Core 2.1下运行应用程序。
您应该将UseBlazor方法复制到您的代码库中，并进行一些小的修改以解决此问题
namespace BlazorHelper
{
using System;
using System.IO;
using System.Linq;
using System.Net.Mime;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.StaticFiles;
using Microsoft.Extensions.FileProviders;
using Microsoft.Net.Http.Headers;
/// <summary>
/// Extension methods for registration related to Blazor.
/// </summary>
/// <remarks>
/// This is almost full rip-off of
/// https://github.com/aspnet/AspNetCore/blob/master/src/Components/src/Microsoft.AspNetCore.Components.Server/Builder/BlazorApplicationBuilderExtensions.cs
/// </remarks>
public static class BlazorExtensions
{
/// <summary>
/// Configures the middleware pipeline to work with Blazor.
/// </summary>
/// <typeparam name="TProgram">Any type from the client app project. This is used to identify the client app assembly.</typeparam>
/// <param name="app">The <see cref="IApplicationBuilder"/>.</param>
/// <returns>The <see cref="IApplicationBuilder"/> with configured Blazor.</returns>
public static IApplicationBuilder UseLocalBlazor<TProgram>(
this IApplicationBuilder app)
{
var clientAssemblyInServerBinDir = typeof(TProgram).Assembly;
return app.UseLocalBlazor(new BlazorOptions
{
ClientAssemblyPath = clientAssemblyInServerBinDir.Location,
});
}
/// <summary>
/// Configures the middleware pipeline to work with Blazor.
/// </summary>
/// <param name="app">The <see cref="IApplicationBuilder"/>.</param>
/// <param name="options">Options to configure the middleware.</param>
/// <returns>The <see cref="IApplicationBuilder"/> with configured Blazor.</returns>
public static IApplicationBuilder UseLocalBlazor(
this IApplicationBuilder app,
BlazorOptions options)
{
// TODO: Make the .blazor.config file contents sane
// Currently the items in it are bizarre and don't relate to their purpose,
// hence all the path manipulation here. We shouldn't be hardcoding 'dist' here either.
var env = (IHostingEnvironment)app.ApplicationServices.GetService(typeof(IHostingEnvironment));
var config = BlazorConfig.Read(options.ClientAssemblyPath);
// First, match the request against files in the client app dist directory
app.UseStaticFiles(new StaticFileOptions
{
FileProvider = new PhysicalFileProvider(config.DistPath),
ContentTypeProvider = CreateContentTypeProvider(config.EnableDebugging),
OnPrepareResponse = SetCacheHeaders
});
// * Before publishing, we serve the wwwroot files directly from source
// (and don't require them to be copied into dist).
// In this case, WebRootPath will be nonempty if that directory exists.
// * After publishing, the wwwroot files are already copied to 'dist' and
// will be served by the above middleware, so we do nothing here.
// In this case, WebRootPath will be empty (the publish process sets this).
if (!string.IsNullOrEmpty(config.WebRootPath))
{
app.UseStaticFiles(new StaticFileOptions
{
FileProvider = new PhysicalFileProvider(config.WebRootPath),
OnPrepareResponse = SetCacheHeaders
});
}
// Accept debugger connections
if (config.EnableDebugging)
{
// Disable MonoDebugProxy, since it require me to maintain copy of Blazor code
// app.UseMonoDebugProxy();
}
// Finally, use SPA fallback routing (serve default page for anything else,
// excluding /_framework/*)
app.MapWhen(IsNotFrameworkDir, childAppBuilder =>
{
var indexHtmlPath = FindIndexHtmlFile(config);
var indexHtmlStaticFileOptions = string.IsNullOrEmpty(indexHtmlPath)
? null : new StaticFileOptions
{
FileProvider = new PhysicalFileProvider(Path.GetDirectoryName(indexHtmlPath)),
OnPrepareResponse = SetCacheHeaders
};
childAppBuilder.UseSpa(spa =>
{
spa.Options.DefaultPageStaticFileOptions = indexHtmlStaticFileOptions;
});
});
return app;
}
private static string FindIndexHtmlFile(BlazorConfig config)
{
// Before publishing, the client project may have a wwwroot directory.
// If so, and if it contains index.html, use that.
if (!string.IsNullOrEmpty(config.WebRootPath))
{
var wwwrootIndexHtmlPath = Path.Combine(config.WebRootPath, "index.html");
if (File.Exists(wwwrootIndexHtmlPath))
{
return wwwrootIndexHtmlPath;
}
}
// After publishing, the client project won't have a wwwroot directory.
// The contents from that dir will have been copied to "dist" during publish.
// So if "dist/index.html" now exists, use that.
var distIndexHtmlPath = Path.Combine(config.DistPath, "index.html");
if (File.Exists(distIndexHtmlPath))
{
return distIndexHtmlPath;
}
// Since there's no index.html, we'll use the default DefaultPageStaticFileOptions,
// hence we'll look for index.html in the host server app's wwwroot.
return null;
}
private static void SetCacheHeaders(StaticFileResponseContext ctx)
{
// By setting "Cache-Control: no-cache", we're allowing the browser to store
// a cached copy of the response, but telling it that it must check with the
// server for modifications (based on Etag) before using that cached copy.
// Longer term, we should generate URLs based on content hashes (at least
// for published apps) so that the browser doesn't need to make any requests
// for unchanged files.
var headers = ctx.Context.Response.GetTypedHeaders();
if (headers.CacheControl == null)
{
headers.CacheControl = new CacheControlHeaderValue
{
NoCache = true
};
}
}
private static bool IsNotFrameworkDir(HttpContext context)
=> !context.Request.Path.StartsWithSegments("/_framework");
private static IContentTypeProvider CreateContentTypeProvider(bool enableDebugging)
{
var result = new FileExtensionContentTypeProvider();
result.Mappings.Add(".dll", MediaTypeNames.Application.Octet);
result.Mappings.Add(".mem", MediaTypeNames.Application.Octet);
if (enableDebugging)
{
result.Mappings.Add(".pdb", MediaTypeNames.Application.Octet);
}
return result;
}
internal class BlazorConfig
{
private BlazorConfig(string assemblyPath)
{
// TODO: Instead of assuming the lines are in a specific order, either JSON-encode
// the whole thing, or at least give the lines key prefixes (e.g., "reload:<someuri>")
// so we're not dependent on order and all lines being present.
var configFilePath = Path.ChangeExtension(assemblyPath, ".blazor.config");
var configLines = File.ReadLines(configFilePath).ToList();
this.SourceMSBuildPath = configLines[0];
if (this.SourceMSBuildPath == ".")
{
this.SourceMSBuildPath = assemblyPath;
}
var sourceMsBuildDir = Path.GetDirectoryName(this.SourceMSBuildPath);
this.SourceOutputAssemblyPath = Path.Combine(sourceMsBuildDir, configLines[1]);
var webRootPath = Path.Combine(sourceMsBuildDir, "wwwroot");
if (Directory.Exists(webRootPath))
{
this.WebRootPath = webRootPath;
}
this.EnableDebugging = configLines.Contains("debug:true", StringComparer.Ordinal);
}
public string SourceMSBuildPath { get; }
public string SourceOutputAssemblyPath { get; }
public string WebRootPath { get; }
public string DistPath
=> Path.Combine(Path.GetDirectoryName(this.SourceOutputAssemblyPath), "dist");
public bool EnableDebugging { get; }
public static BlazorConfig Read(string assemblyPath)
=> new BlazorConfig(assemblyPath);
}
}
}
用法：
// Use this insted of standard 'UseBlazor'
app.UseLocalBlazor<BlazorApp.Program>();