PowerShell Add-Type Simple C# 結構——一種有效，一種無效

Question

我在 p-Invoking 一些 API 函數方面取得了一些成功，但現在一些看似簡單的事情讓我感到困惑。

此代碼有效：

Add-Type -TypeDefinition @'
using System;
using System.IO;
using System.Text;
using System.Runtime.InteropServices;

public class WPAPI1 {

    [StructLayout(LayoutKind.Sequential)]
    public struct POINT {
        public long x;
        public long y;

        public POINT( long x, long y)
        {
            this.x = x;
            this.y = y;
        }
    };
}
'@

Output 和測試：

PS > Add-Type -TypeDefinition @'
>> using System;
>> using System.IO;
>> using System.Text;
>> using System.Runtime.InteropServices;
>>
>> public class WPAPI1 {
>>
>>     [StructLayout(LayoutKind.Sequential)]
>>     public struct POINT {
>>         public long x;
>>         public long y;
>>
>>         public POINT( long x, long y)
>>         {
>>             this.x = x;
>>             this.y = y;
>>         }
>>     };
>> }
>> '@
>>
WARNING: The generated type defines no public methods or properties.
PS > $p = [WPAPI1+POINT]::new(5,10)
PS > $p

x  y
-  -
5 10

但是這段代碼不會編譯：

Add-Type -TypeDefinition @'
using System;
using System.IO;
using System.Text;
using System.Runtime.InteropServices;

public class WPAPI2 {

    StructLayout(LayoutKind.Sequential)]
    public struct RECT {
        public long left;
        public long top;
        public long right;
        public long bottom;

        public RECT(long left, long top, long right, long botton)
        {
            this.left   = left;
            this.top    = top;
            this.right  = right;
            this.bottom = bottom;
        }
    };
}
'@

拋出以下錯誤：

Add-Type : c:\Users\keith\AppData\Local\Temp\3v2a5y04.0.cs(8) : Method must have a
return type
c:\Users\keith\AppData\Local\Temp\3v2a5y04.0.cs(7) :
c:\Users\keith\AppData\Local\Temp\3v2a5y04.0.cs(8) : >>>
StructLayout(LayoutKind.Sequential)]
c:\Users\keith\AppData\Local\Temp\3v2a5y04.0.cs(9) :     public struct RECT {
At line:1 char:1
+ Add-Type -TypeDefinition @'
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidData: (Microsoft.Power...peCompilerError:AddTypeCo
   mpilerError) [Add-Type], Exception
    + FullyQualifiedErrorId : SOURCE_CODE_ERROR,Microsoft.PowerShell.Commands.AddTypeCo
   mmand

Add-Type : c:\Users\keith\AppData\Local\Temp\3v2a5y04.0.cs(8) : Identifier expected
c:\Users\keith\AppData\Local\Temp\3v2a5y04.0.cs(7) :
c:\Users\keith\AppData\Local\Temp\3v2a5y04.0.cs(8) : >>>
StructLayout(LayoutKind.Sequential)]
c:\Users\keith\AppData\Local\Temp\3v2a5y04.0.cs(9) :     public struct RECT {
At line:1 char:1
+ Add-Type -TypeDefinition @'
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidData: (Microsoft.Power...peCompilerError:AddTypeCo
   mpilerError) [Add-Type], Exception
    + FullyQualifiedErrorId : SOURCE_CODE_ERROR,Microsoft.PowerShell.Commands.AddTypeCo
   mmand

Add-Type : c:\Users\keith\AppData\Local\Temp\3v2a5y04.0.cs(8) : ; expected
c:\Users\keith\AppData\Local\Temp\3v2a5y04.0.cs(7) :
c:\Users\keith\AppData\Local\Temp\3v2a5y04.0.cs(8) : >>>
StructLayout(LayoutKind.Sequential)]
c:\Users\keith\AppData\Local\Temp\3v2a5y04.0.cs(9) :     public struct RECT {
At line:1 char:1
+ Add-Type -TypeDefinition @'
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidData: (Microsoft.Power...peCompilerError:AddTypeCo
   mpilerError) [Add-Type], Exception
    + FullyQualifiedErrorId : SOURCE_CODE_ERROR,Microsoft.PowerShell.Commands.AddTypeCo
   mmand

Add-Type : Cannot add type. Compilation errors occurred.
At line:1 char:1
+ Add-Type -TypeDefinition @'
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidData: (:) [Add-Type], InvalidOperationException
    + FullyQualifiedErrorId : COMPILER_ERRORS,Microsoft.PowerShell.Commands.AddTypeComm
   and

PS >

關注第一個錯誤： Method must have a return type ，我的互聯網搜索沒有幫助。 構造函數不應該需要返回類型，我已經對RECT的大小寫和拼寫進行了三重檢查。

我難住了。 請指教...

編輯：

修復了丟失的[ （以為我的錯誤已經改變，但已經很晚了）。 之后，代碼會產生不同的錯誤：

Add-Type : c:\Users\keith\AppData\Local\Temp\saoucata.0.cs(17) : Warning as Error:
Assignment made to same variable; did you mean to assign something else?
c:\Users\keith\AppData\Local\Temp\saoucata.0.cs(16) :         {
c:\Users\keith\AppData\Local\Temp\saoucata.0.cs(17) : >>>             this.left = left
; this.top = top ; this.right = right ; this.bottom = bottom;
c:\Users\keith\AppData\Local\Temp\saoucata.0.cs(18) :         }
At line:1 char:1
+ Add-Type -TypeDefinition @'
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidData: (Microsoft.Power...peCompilerError:AddTypeCo
   mpilerError) [Add-Type], Exception
    + FullyQualifiedErrorId : SOURCE_CODE_ERROR,Microsoft.PowerShell.Commands.AddTypeCo
   mmand

Add-Type : c:\Users\keith\AppData\Local\Temp\saoucata.0.cs(17) : Use of possibly
unassigned field 'bottom'
c:\Users\keith\AppData\Local\Temp\saoucata.0.cs(16) :         {
c:\Users\keith\AppData\Local\Temp\saoucata.0.cs(17) : >>>             this.left = left
; this.top = top ; this.right = right ; this.bottom = bottom;
c:\Users\keith\AppData\Local\Temp\saoucata.0.cs(18) :         }
At line:1 char:1
+ Add-Type -TypeDefinition @'
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidData: (Microsoft.Power...peCompilerError:AddTypeCo
   mpilerError) [Add-Type], Exception
    + FullyQualifiedErrorId : SOURCE_CODE_ERROR,Microsoft.PowerShell.Commands.AddTypeCo
   mmand

Add-Type : Cannot add type. Compilation errors occurred.
At line:1 char:1
+ Add-Type -TypeDefinition @'
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidData: (:) [Add-Type], InvalidOperationException
    + FullyQualifiedErrorId : COMPILER_ERRORS,Microsoft.PowerShell.Commands.AddTypeComm
   and

我很感激幫助。 這里的視障人士 - 必須放大很多 - 可以讓一個人失去“大局”，可以這么說：：D

Answer 1

Add-Type -TypeDefinition @'
using System;
using System.IO;
using System.Text;
using System.Runtime.InteropServices;

public class WPAPI2 {

    [StructLayout(LayoutKind.Sequential)]
    public struct RECT {
        public long left;
        public long top;
        public long right;
        public long bottom;

        public RECT(long left, long top, long right, long bottom)
        {
            this.left   = left;
            this.top    = top;
            this.right  = right;
            this.bottom = bottom;
        }
    };
}
'@

注意：在 StructuredLayout 之前的“[”和 RECT 簽名中的“botto n ”與“botto m ”。