升级IronPython从V2.3.7至2.7.11时Microsoft.Scripting.Math.BigInteger类缺失的解决方案咨询

Hey there, I’ve dealt with this exact problem when upgrading IronPython from older versions to 2.7.x, so here are the most reliable fixes to get your code working again:

1. Switch to .NET's Built-in System.Numerics.BigInteger #

IronPython 2.7+ shifted to using the official .NET framework's System.Numerics.BigInteger as its underlying big integer implementation, which is why the old Microsoft.Scripting.Math.BigInteger was removed. This is the recommended replacement for several reasons:

• It’s maintained as part of the .NET ecosystem, so it’s more stable and feature-rich.
• Most API methods from the old BigInteger have direct equivalents here, making migration straightforward.

Steps to implement: #

• In IronPython scripts:
  1. Add a reference to the System.Numerics assembly at the top of your script:

     import clr
     clr.AddReference("System.Numerics")
     from System.Numerics import BigInteger
     

  2. Replace all instances of Microsoft.Scripting.Math.BigInteger with BigInteger in your code.
• In C# projects using IronPython:
  1. Add a reference to the System.Numerics assembly in your project (it’s included with .NET 4.0 and later).
  2. Update your using statements:

     // Replace this
     using Microsoft.Scripting.Math;
     // With this
     using System.Numerics;
     

Note: #

Double-check any edge-case operations (like custom string formatting or bitwise operations) to ensure they behave the same as the old implementation. In most cases, the transition will be seamless.

2. Fall Back to Python's Native int Type #

If you’re writing pure IronPython code (not interacting with C# directly), you can often just use Python’s built-in int type. IronPython automatically handles big integers by mapping them to System.Numerics.BigInteger under the hood, so you don’t need to explicitly reference the .NET type.

For example:

# Instead of:
# from Microsoft.Scripting.Math import BigInteger
# big_num = BigInteger(12345678901234567890)

# Just use:
big_num = 12345678901234567890
# IronPython will handle it as a big integer automatically

This is the simplest option if your code doesn’t require explicit type references for interop with C#.

3. Avoid Unofficial Workarounds #

While you might find references to internal IronPython types (like those in IronPython.Modules) that could mimic the old BigInteger, these are not designed for public use. They’re likely to break in future updates and lack the stability of the .NET-native alternative, so they’re not recommended for production code.

内容的提问来源于stack exchange，提问作者Jack Le