Azure Functions绑定重定向 [英] Azure Functions binding redirect

问题描述

是否可以在azure函数文件夹结构中包含web.config或app.config文件，以允许程序集绑定重定向？

Is it possible to include a web.config or app.config file in the azure functions folder structure to allow assembly binding redirects?

推荐答案

假设您使用的是最新的（June'17）Visual Studio 2017 Function Tooling，在 npiasecki 在问题＃992

Assuming you are using the latest (June'17) Visual Studio 2017 Function Tooling, I derived a somewhat-reasonable config-based solution for this following a snippet of code posted by npiasecki over on Issue #992.

如果这是通过框架进行管理，那将是理想的选择，但是至少受配置驱动，您需要更多的变更隔离。我想您还可以在编写此配置或生成代码之前，使用一些预构建步骤或T4模板来调和项目中nuget的版本（及其依赖关系）。

It would be ideal if this were managed through the framework, but at least being configuration-driven you have a bit more change isolation. I suppose you could also use some pre-build steps or T4 templating that reconciles the versions of the nugets in the project (and their dependencies) before writing out this config or generating code.

..不得不记住要更新当您更新NuGet程序包时，使用BindingRedirects 配置（无论如何，这在app.configs中通常是一个问题）。如果您需要重定向 Newtonsoft 。

.. becomes having to remember to update the BindingRedirects config when you update the NuGet package (this is often a problem in app.configs anyway). You may also have an issue with the config-driven solution if you need to redirect Newtonsoft.

您可能还对配置驱动的解决方案有疑问。 ，我们使用的是新的Azure Fluent NuGet，它依赖于 Microsoft.IdentityModel.Clients.ActiveDirectory 的旧版本，而不是所使用的常规ARM管理库的版本。并排在特定功能中。

In our case, we were using the new Azure Fluent NuGet that had a dependency on an older version of Microsoft.IdentityModel.Clients.ActiveDirectory than the version of the normal ARM management libraries which are used side-by-side in a particular Function.

{
    "IsEncrypted": false,
    "Values": {
        "BindingRedirects": "[ { \"ShortName\": \"Microsoft.IdentityModel.Clients.ActiveDirectory\", \"RedirectToVersion\": \"3.13.9.1126\", \"PublicKeyToken\": \"31bf3856ad364e35\" } ]"
    }
}

FunctionUtilities.cs

FunctionUtilities.cs

using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System;
using System.Globalization;
using System.Linq;
using System.Reflection;

namespace Rackspace.AzureFunctions
{
    public static class FunctionUtilities
        {
            public class BindingRedirect
            {
                public string ShortName { get; set; }
                public string PublicKeyToken { get; set; }
                public string RedirectToVersion { get; set; }
            }

            public static void ConfigureBindingRedirects()
            {
                var config = Environment.GetEnvironmentVariable("BindingRedirects");
                var redirects = JsonConvert.DeserializeObject<List<BindingRedirect>>(config);
                redirects.ForEach(RedirectAssembly);
            }

            public static void RedirectAssembly(BindingRedirect bindingRedirect)
            {
                ResolveEventHandler handler = null;

                handler = (sender, args) =>
                {
                    var requestedAssembly = new AssemblyName(args.Name);

                    if (requestedAssembly.Name != bindingRedirect.ShortName)
                    {
                        return null;
                    }

                    var targetPublicKeyToken = new AssemblyName("x, PublicKeyToken=" + bindingRedirect.PublicKeyToken)
                        .GetPublicKeyToken();
                    requestedAssembly.Version = new Version(bindingRedirect.RedirectToVersion);
                    requestedAssembly.SetPublicKeyToken(targetPublicKeyToken);
                    requestedAssembly.CultureInfo = CultureInfo.InvariantCulture;

                    AppDomain.CurrentDomain.AssemblyResolve -= handler;

                    return Assembly.Load(requestedAssembly);
                };

                AppDomain.CurrentDomain.AssemblyResolve += handler;
            }
        }
    }

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