Where Is My System.Numerics Namespace

Where is my System.Numerics namespace?

You need to add an assembly reference to System.Numerics.dll

The MSDN entry on BigInteger states:

BigInteger Structure

...

Namespace: System.Numerics

Assembly: System.Numerics (in System.Numerics.dll)

How to add a reference to System.Numerics.dll

http://msdn.microsoft.com/en-us/library/7314433t(v=vs.80).aspx

From MSDN:

1. In Solution Explorer, select the project.
2. On the Project menu, choose Add Reference.
3. The Add Reference dialog box opens.
4. Select the tab indicating the type of component you want to
   reference.
5. In the top pane, select the component you want to reference, and
   then click the Select button. Press CTRL while clicking to select
   multiple components.

How do I find the library System.Numerics in the ADD reference?

You have to add in the using System.Numberics to your project and then it should compile and run.

1. Right click on Reference (Select Add Reference)
2. .NET select
3. Scroll down and select System.Numeric

Note: They say they are in alphabetical order and they sort of but I also have FSharp.Core for example after the M's and so forth. So it is sort of by alphabet but not completely either.

Make sure you are targeting the .NET 4.0 system. I am somewhat new to Visual Studio but I do not think that these were available in other versions. i don't use these all that much.

C# Where to download System.Numerics

If you have the .NET framework, you should have the .DLL file in your windows directory.

Mine is located here:

C:\Windows\Microsoft.NET\Framework\v4.0.30319\System.Numerics.DLL

Do you have the .NET framework installed?

The type or namespace name 'Numerics' does not exist in the namespace 'System'

mcs -r:System.Numerics.dll main.cs

man mcs should do you the honours.

Depending on your mono version you might want to use dmcs and/or upgrade.

Oh, and it's BigInteger, not BigInt

How do I use System.Numerics in Mono C# in MonoDevelop?

You need to add a manual reference to that assembly (and any others in the framework that you need to use, "System" is included by default)

Double click on the Projects "References" in the solution explorer:

Usage of System.Numerics in VS2008

The only way the System.Numerics namespace is used is in the UIDHelper class to convert a GUID to a decimal number. It essentially writes out a 16 byte integer, created from the bytes of a GUID, as a decimal number.

I don't know how important this value is. You have two options:

1. You can replace this code with similar code that does not use the BigInteger type but is good enough for your purposes.

2. You can implement the BigInteger type yourself. There are several implementations, including in the .NET Framework itself, in the J# class libraries (See http://msdn.microsoft.com/en-us/magazine/cc163696.aspx).

System.Numerics when targeting net45

Try to add an assembly reference to System.Numerics.dll in your project.

Where can I find the source code for System.Numerics.BigInteger?

This has been asked before on MSDN BigInteger source code

Your not going to get it with code comments unless you have access to the private Micrsoft source and symbol servers.

The source stepping is your best bet. I too have experienced the problems you mention and found the RedGate source stepper (part of Reflector trial on a VM) does the trick.

An alternate would be to use a 3rd party if you dont have time to write your own:
http://www.codeproject.com/Articles/2728/C-BigInteger-Class

UPDATE:

• .NET Framework 4.8: http://referencesource.microsoft.com/#System.Numerics/System/Numerics/BigInteger.cs,035eb7acfa6585a0
• .NET 5+: https://github.com/dotnet/runtime/blob/main/src/libraries/System.Runtime.Numerics/src/System/Numerics/BigInteger.cs

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