PowerShell Add-Type Simple C# Structures -- 一个有效，一个无效

Question

我在p-调用一些API函数方面取得了一些成功，但现在一些看似简单的事情让我感到困惑。

此代码有效：

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;
}
};
}
'@

输出和测试：

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

但这段代码无法编译：

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;
}
};
}
'@

引发以下错误：

Add-Type : c:UserskeithAppDataLocalTemp3v2a5y04.0.cs(8) : Method must have a
return type
c:UserskeithAppDataLocalTemp3v2a5y04.0.cs(7) :
c:UserskeithAppDataLocalTemp3v2a5y04.0.cs(8) : >>>
StructLayout(LayoutKind.Sequential)]
c:UserskeithAppDataLocalTemp3v2a5y04.0.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:UserskeithAppDataLocalTemp3v2a5y04.0.cs(8) : Identifier expected
c:UserskeithAppDataLocalTemp3v2a5y04.0.cs(7) :
c:UserskeithAppDataLocalTemp3v2a5y04.0.cs(8) : >>>
StructLayout(LayoutKind.Sequential)]
c:UserskeithAppDataLocalTemp3v2a5y04.0.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:UserskeithAppDataLocalTemp3v2a5y04.0.cs(8) : ; expected
c:UserskeithAppDataLocalTemp3v2a5y04.0.cs(7) :
c:UserskeithAppDataLocalTemp3v2a5y04.0.cs(8) : >>>
StructLayout(LayoutKind.Sequential)]
c:UserskeithAppDataLocalTemp3v2a5y04.0.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 >

关注第一个错误：Method must have a return type，我的互联网搜索没有帮助。构造函数不应该需要返回类型，我已经对RECT的大小写和拼写进行了三次检查。

我被难住了。请告知。。。

编辑：

修复了丢失的[(本以为我的错误已经改变，但为时已晚(。之后，代码会产生不同的错误：

Add-Type : c:UserskeithAppDataLocalTempsaoucata.0.cs(17) : Warning as Error:
Assignment made to same variable; did you mean to assign something else?
c:UserskeithAppDataLocalTempsaoucata.0.cs(16) :         {
c:UserskeithAppDataLocalTempsaoucata.0.cs(17) : >>>             this.left = left
; this.top = top ; this.right = right ; this.bottom = bottom;
c:UserskeithAppDataLocalTempsaoucata.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:UserskeithAppDataLocalTempsaoucata.0.cs(17) : Use of possibly
unassigned field 'bottom'
c:UserskeithAppDataLocalTempsaoucata.0.cs(16) :         {
c:UserskeithAppDataLocalTempsaoucata.0.cs(17) : >>>             this.left = left
; this.top = top ; this.right = right ; this.bottom = bottom;
c:UserskeithAppDataLocalTempsaoucata.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

我很感激你的帮助。这里的视障人士——必须放大很多——会让人失去"视觉"；大画面"；，可以这么说！：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"botton"与RECT签名中的"bottom