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lang: ja-jp
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# C# 実行されているアプリケーションのスタックサイズを取得する方法 2022-07-21

> Checking stack size in C#
> https://stackoverflow.com/questions/2901185/checking-stack-size-in-c-sharp

## 確認するプログラム

    public static class Extensions
    {
        public static void StartAndJoin(this Thread thread, string header)
        {
            thread.Start(header);
            thread.Join();
        }
    }
    internal class Program
    {
        [DllImport("kernel32.dll")]
        static extern void GetCurrentThreadStackLimits(out uint lowLimit, out uint highLimit);

        static void WriteAllocatedStackSize(object header)
        {
            GetCurrentThreadStackLimits(out var low, out var high);
            Console.WriteLine($"{header,-19}:  {((high - low) / 1024),4} KB");
        }

        static void Main(string[] args)
        {
            Console.WriteLine("ビルドログ確認 OLD");

            WriteAllocatedStackSize("Main    Stack Size");

            new Thread(WriteAllocatedStackSize, 1024 * 0).StartAndJoin("Default Stack Size");
            new Thread(WriteAllocatedStackSize, 1024 * 128).StartAndJoin(" 128 KB Stack Size");
            new Thread(WriteAllocatedStackSize, 1024 * 256).StartAndJoin(" 256 KB Stack Size");
            new Thread(WriteAllocatedStackSize, 1024 * 512).StartAndJoin(" 512 KB Stack Size");
            new Thread(WriteAllocatedStackSize, 1024 * 1024).StartAndJoin("   1 MB Stack Size");
            new Thread(WriteAllocatedStackSize, 1024 * 2048).StartAndJoin("   2 MB Stack Size");
            new Thread(WriteAllocatedStackSize, 1024 * 4096).StartAndJoin("   4 MB Stack Size");
            new Thread(WriteAllocatedStackSize, 1024 * 8192).StartAndJoin("   8 MB Stack Size");

            Console.ReadLine();
        }
    }

## Release/Any CPU

### `.NET Framework 4.8`（旧csproj）

Main    Stack Size :  1024 KB
Default Stack Size :  1024 KB
 128 KB Stack Size :   256 KB
 256 KB Stack Size :   256 KB
 512 KB Stack Size :   512 KB
   1 MB Stack Size :  1024 KB
   2 MB Stack Size :  2048 KB
   4 MB Stack Size :  4096 KB
   8 MB Stack Size :  8192 KB

### `net48`

Main    Stack Size :  1024 KB
Default Stack Size :  1024 KB
 128 KB Stack Size :   256 KB
 256 KB Stack Size :   256 KB
 512 KB Stack Size :   512 KB
   1 MB Stack Size :  1024 KB
   2 MB Stack Size :  2048 KB
   4 MB Stack Size :  4096 KB
   8 MB Stack Size :  8192 KB

### `net6.0`

Main    Stack Size :  1536 KB
Default Stack Size :  1536 KB
 128 KB Stack Size :   128 KB
 256 KB Stack Size :   256 KB
 512 KB Stack Size :   512 KB
   1 MB Stack Size :  1024 KB
   2 MB Stack Size :  2048 KB
   4 MB Stack Size :  4096 KB
   8 MB Stack Size :  8192 KB

## Release/x64

### `.NET Framework 4.8`（旧csproj）

Main    Stack Size :  4096 KB
Default Stack Size :  4096 KB
 128 KB Stack Size :   256 KB
 256 KB Stack Size :   256 KB
 512 KB Stack Size :   512 KB
   1 MB Stack Size :  1024 KB
   2 MB Stack Size :  2048 KB
   4 MB Stack Size :  4096 KB
   8 MB Stack Size :  8192 KB

### `net48`

Main    Stack Size :  4096 KB
Default Stack Size :  4096 KB
 128 KB Stack Size :   256 KB
 256 KB Stack Size :   256 KB
 512 KB Stack Size :   512 KB
   1 MB Stack Size :  1024 KB
   2 MB Stack Size :  2048 KB
   4 MB Stack Size :  4096 KB
   8 MB Stack Size :  8192 KB

### `net6.0`

Main    Stack Size :  1536 KB
Default Stack Size :  1536 KB
 128 KB Stack Size :   128 KB
 256 KB Stack Size :   256 KB
 512 KB Stack Size :   512 KB
   1 MB Stack Size :  1024 KB
   2 MB Stack Size :  2048 KB
   4 MB Stack Size :  4096 KB
   8 MB Stack Size :  8192 KB

## 結果

* `net48` では、オールドスタイル／SDKスタイルによる違いはなく、`Any CPU` では `1024 KB`、`x64`では `4096 KB`。
* `net6.0` では、`Any CPU`／`x64`に違いはなく、`1536 KB`。

###### tags: `C#` `スタックサイズ` `StackOverflowException`