安装1.4版本后仍提示缺少Google.Cloud.BigQuery.V2 1.2程序集求助

Hey Adam, I’ve run into similar NuGet version mismatch headaches before, so let’s break down why this is happening and how to fix it properly.

Why You’re Seeing the 1.2.0.0 Error With 1.4 Installed #

The core issue almost always boils down to dependency conflicts or misconfigured binding redirects. Here’s the breakdown:

• Indirect dependencies: Other NuGet packages in your solution (like other Google Cloud client libraries) might still reference the 1.2.0.0 version of Google.Cloud.BigQuery.V2. Even though you installed 1.4, these dependent packages are telling your app to load the older version.
• Incorrect binding redirect: Your current redirect config is actually forcing requests to use 1.2.0.0 instead of 1.4.0.0. You set oldVersion="0.0.0.0-1.2.0.0" and newVersion="1.2.0.0"—this means any request for versions up to 1.2 stays on 1.2, not redirect to 1.4.
• Stale cache or project references: Visual Studio’s build cache or leftover references in your project files might still point to the old version, even after you updated the NuGet package.

Step-by-Step Fixes #

Let’s tackle these issues one by one:

1. Fix the Binding Redirect
   Update your app.config (or web.config for web projects) to redirect all old versions to 1.4.0.0:

   <dependentAssembly>
     <assemblyIdentity name="Google.Cloud.BigQuery.V2" publicKeyToken="185c282632e132a0" culture="neutral" />
     <bindingRedirect oldVersion="0.0.0.0-1.4.0.0" newVersion="1.4.0.0" />
   </dependentAssembly>
   

   This tells .NET to use the 1.4 version whenever any part of your app requests any version from 0.0.0.0 up to 1.4.0.0.

2. Check for Outdated Indirect Dependencies

   • Open the Manage NuGet Packages for Solution window.
   • Go to the Consolidate tab—this shows if any projects in your solution use different versions of the same package.
   • Look for packages that depend on Google.Cloud.BigQuery.V2 (like Google.Cloud.Storage.V1 or other Google Cloud libraries) and update them to versions compatible with 1.4.0.0. Most Google Cloud packages are versioned to work together, so updating all related packages should resolve the conflict.

3. Perform a Full Clean and Cache Reset

   • Delete the bin and obj folders from all projects in your solution (manual deletion works, or use a tool like Clean Solution Plus).
   • Clear the NuGet cache: Run dotnet nuget locals all --clear in your terminal, or go to Tools > Options > NuGet Package Manager > General and click Clear All NuGet Cache(s).
   • Rebuild your solution from scratch.

4. Verify Project References

   • Open your .csproj file in a text editor and check for hard-coded references to Google.Cloud.BigQuery.V2. Ensure all references point to the 1.4.0.0 version and there are no leftover paths to old DLLs.

Why Downgrading to 1.2 Works #

When you downgrade to 1.2, you’re aligning your installed version with the version that other dependencies are requesting. This eliminates the conflict, but it’s a temporary fix—you’ll want to get to 1.4 to benefit from bug fixes and new features.

内容的提问来源于stack exchange，提问作者Adam Hey