Dynamic array in C# (vb.net snippet)

Question

Private Function getFoo(ByVal _FileInfo As FileInfo) As foo()
    Dim provider As New ExcelStorage(GetType(foo))
    provider.StartRow = 2
    provider.StartColumn = 1
    provider.FileName = _FileInfo.FullName
    Dim res() As foo = provider.ExtractRecords()
    Return res
End Function

I have the above code in vb.net that i'm trying to convert to C#. I'm using FileHelper library to extract data from Excel. This is my conversion to C#.

public static foo GetFoo(FileInfo fInfo)
{
var provider = new ExcelStorage(typeof(foo));
provider.StartRow = 2;
provider.StartColumn = 1;
provider.FileName = fInfo.FullName;
foo res[] = provider.ExtractRecords();
return res;
}

What am I doing wrong here. I'm getting Bad array declator. Do I have to declare the size the array first?

Thanks

edit: I change the code as suggested. However, I'm getting this error.

"Cannot implicitly convert type 'object[]' to 'foo[]'. An explicit conversion exists (are you missing a cast?)"

I though I already set the type to foo in the ExcelStorage as typeof(foo). Nevermind, I did it with casting.

Grzenio · Accepted Answer · 2010-08-24 15:54:47Z

4

Should be: foo[] res = provider.ExtractRecords()

answered Aug 24, 2010 at 15:54

Grzenio

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Comments

James Curran · Accepted Answer · 2010-08-24 15:55:08Z

2

foo res[] = provider.ExtractRecords();

should be

foo[] res = provider.ExtractRecords();

Similarly, as you are returning an array of foos, the declaration should be:

public static foo[] GetFoo(FileInfo fInfo)

answered Aug 24, 2010 at 15:55

James Curran

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Comments

JaredPar · Accepted Answer · 2010-08-24 15:55:24Z

1

In C# the array syntax is attached to the type and not the variable

foo[] res = provider.ExtractRecords();

answered Aug 24, 2010 at 15:55

JaredPar

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user334899 · Accepted Answer · 2010-08-24 15:55:25Z

1

In C#, you declare array variables like so Type[] VariableName not like this Type VariableName[]

answered Aug 24, 2010 at 15:55

user334899

Comments

Guffa · Accepted Answer · 2010-08-24 16:05:52Z

1

It's foo[] res instead of foo res[].

In VB you can use either the syntax where being an array is a property of the variable:

Dim x() As Integer

or where being an array is a property of the type:

Dim x As Integer()

The former makes more sense in VB 6, where arrays are a special kind of varaibles, and the latter makes more sense in VB.NET where arrays are objects.

In C# being an array is always part of the type:

int[] x;

edited Aug 24, 2010 at 16:05

answered Aug 24, 2010 at 15:54

Guffa

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asawyer · Accepted Answer · 2010-08-24 15:57:46Z

0

Plus your method needs to return an array as well

public static foo[] GetFoo(FileInfo fInfo)

answered Aug 24, 2010 at 15:57

asawyer

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Comments

badbod99 · Accepted Answer · 2010-08-24 16:10:41Z

0

Fixed code:

public static foo[] GetFoo(FileInfo fInfo)
{
  var provider = new ExcelStorage(typeof(foo));
  provider.StartRow = 2;
  provider.StartColumn = 1;
  provider.FileName = fInfo.FullName;
  foo[] res = provider.ExtractRecords();
  return res;
}

answered Aug 24, 2010 at 16:10

badbod99

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