Category: .NET

16 Jun 2016 10:09

Joined:	10/02/2005
Level:	Bronze
Points:	26

Points:	5

How to implement typedef struct union in C#

Hi guys,

I have to rewrite this C++ code in C#. C# does not support typedef or union. How can I do this in C# ?

typedef enum {
TYPE_FLOAT, TYPE_STRING,TYPE_INTEGER, TYPE_DATETIME
} tdFuncType;

typedef struct {
char szNm[256]; // Identifier name, if not constant or computed
tdFuncType ft;
union {
double dFloat; // TYPE_FLOAT
long lInteger; // TYPE_INTEGER
time_t tDateTime; // TYPE_DATETIME
char szString[256]; // TYPE_STRING, max string size is 255
} val;
} tdFuncValue;

// All values
typedef struct {
long lCt; // Number of actual values: 1 to 11
tdFuncValue fv[11]; // Values
} tdFuncValues;

Any ideas ?

Thanks.

Pr.

#766509

17 Jun 2016 01:29

Joined:	15/12/2015
Level:	Gold
Points:	1308

Points:	4

Hi,
In C# you can use 'StructLayout(LayoutKind.Explicit)' and 'FieldOffset' attributes to create equivalent functionality to UNION in C.
'StructLayout(LayoutKind.Explicit)' allows us to control the physical layout of data fields of a class/structure in memory. It is available in library 'System.Runtime.InteropServices'.
Please go through this URL for more detailed information and source code:
https://msdn.microsoft.com/en-us/library/system.runtime.interopservices.structlayoutattribute.aspx
Also refer this:
https://social.msdn.microsoft.com/Forums/en-US/019a258e-8d50-4a9f-b0ef-8311208ebb6a/typedefequivalent-in-c?forum=csharplanguage

#766600

21 Jun 2016 02:40

Joined:	13/06/2007
Level:	Gold
Points:	21327

Points:	4

No, there's no equivalent of typedef in C# you can use 'using ' directives instead, see below snippet


using CustomerList = System.Collections.Generic.List<Customer>;

If you need it across multiple files then a simple struct as a wrapper will do the job.
1) Even with C++, you do need keyword "typedef" to declare structure or class. I think this is C anachronism.
2) C# structure is semantically the closest to C++; with classes, for example, there are much more differences. C# structure carry value semantic, but C# classes -- reference semantics and a lot more differences.

Thanks
Koolprasd2003
Editor, DotNetSpider MVM
Microsoft MVP 2014 [ASP.NET/IIS]

#766617

21 Jun 2016 20:28

Joined:	08/07/2010
Level:	Gold
Points:	6482

Points:	2

In C#, you need to use either structures or classes. If you have reference types then go for classes else go for structures.

Miss. Jain
Microsoft Certified Technology Specialist in .Net

#766638

22 Jun 2016 00:27

Joined:	12/12/2013
Level:	Gold
Points:	529

Points:	3

Hi,

Go through the below mentioned Links, It will help you.

1.http://stackoverflow.com/questions/5630149/how-to-convert-a-c-struct-with-union-into-c

2.http://stackoverflow.com/questions/8006965/how-use-struct-with-union-in-c-sharp

3.http://www.codeproject.com/Questions/141385/typedef-in-C

#766885

28 Jun 2016 13:43

Joined:	20/03/2013
Level:	Gold
Points:	4176

Points:	2

Please find the below links ....

1.http://stackoverflow.com/questions/5630149/how-to-convert-a-c-struct-with-union-into-c

2.http://stackoverflow.com/questions/8006965/how-use-struct-with-union-in-c-sharp

3.http://www.c-sharpcorner.com/article/using-pointers-in-C-Sharp/

SRI RAMA PHANI BHUSHAN KAMBHAMPATI

How to implement typedef struct union in C#

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