c# - 使用 Azure Function 应用程序 2.x 设置 Azure Functions 应用程序基目录

Question

我需要将 Azure Functions 应用的基目录设置为 azurewebjobsscriptroot，如下所示，但出现异常

var config = new ConfigurationBuilder()
    .SetBasePath("%HOME%\site\wwwroot")   //error
    .AddJsonFile("Settings.json", optional: true, reloadOnChange: true)
    .AddEnvironmentVariables()
    .Build();

System.ArgumentException : The path must be absolute. Parameter name: root at Microsoft.Extensions.FileProviders.PhysicalFileProvider..ctor(String root,ExclusionFilters filters) at Microsoft.Extensions.Configuration.FileConfigurationExtensions.SetBasePath(IConfigurationBuilder builder,String basePath)

Azure 函数 2.x

VS 2017

ExecutionContext is null to non-function methods via IoC, alternative to ExecutionContext.FunctionAppDirectory

https://learn.microsoft.com/en-us/azure/azure-functions/functions-app-settings#azurewebjobsscriptroot

Answer 1

您可能想在使用路径之前先扩展它。这样，嵌入在字符串中的环境变量就可以替换为该变量的等效值。生成配置的有效基本路径。

var AzureWebJobsScriptRoot = "%HOME%\site\wwwroot";

var expandedRootPath = Environment.ExpandEnvironmentVariables(AzureWebJobsScriptRoot);

var config = new ConfigurationBuilder()
    .SetBasePath(expandedRootPath)
    .AddJsonFile("Settings.json", optional: true, reloadOnChange: true)
    .AddEnvironmentVariables()
    .Build();

引用Environment.ExpandEnvironmentVariables(String) Method