strange exception with datatable

[mathieu]

I have a class deriving from datatable. In ctor i define the columns
and set the pk. And there it crashes on the unique = true line.

public DTNomenclatureLevel() : DataTable
{
try
{
Columns.Clear();

base.Columns.AddRange(new DataColumn[] {new DataColumn("Id",
System.Type.GetType("System.Int32")), new DataColumn("Lib",
System.Type.GetType("System.String"))} );


//PK (Id)
base.Columns[0].Unique = true;
base.PrimaryKey = new DataColumn[]{base.Columns[0]};
}
catch(Exception e)
{
Console.WriteLine(e.ToString());
}
}

What is strange is that it's was working well up to this morning ???

here is the error message:

System.Object {System.NullReferenceException} System.Object
StackTrace " at System.Data.DataTable.GetIndex(Int32[] indexDesc,
DataViewRowState recordStates, IFilter rowFilter)\r\n at
System.Data.DataColumn.get_SortIndex()\r\n at
System.Data.DataColumn.CheckUnique()\r\n at
System.Data.DataColumn.set_Unique(Boolean value)\r\n at
TNS.AdRequest.Core.DTNomenclatureLevel..ctor

Anyone have a clue?
thanks
mat

 

[Miha Markic [MVP C#]]

Hi,

Works for me.
Are you sure that the error is there?
Can you creata a repro sample?

 

[mathieu]

Thanks for your response but i found what was going wrong.
I had override (well new) the Reset Function of DataTable and was not calling
base.Reset in it.

....And the constructor is calling this function.

So watch out folks

but thanks anyway.
mathieu

Hi,

Works for me.
Are you sure that the error is there?
Can you creata a repro sample?

--
Miha Markic [MVP C#] - RightHand .NET consulting & development
miha at rthand com
www.rthand.com

I have a class deriving from datatable. In ctor i define the columns
and set the pk. And there it crashes on the unique = true line.

public DTNomenclatureLevel() : DataTable
{
try
{
Columns.Clear();

base.Columns.AddRange(new DataColumn[] {new DataColumn("Id",
System.Type.GetType("System.Int32")), new DataColumn("Lib",
System.Type.GetType("System.String"))} );


//PK (Id)
base.Columns[0].Unique = true;
base.PrimaryKey = new DataColumn[]{base.Columns[0]};
}
catch(Exception e)
{
Console.WriteLine(e.ToString());
}
}

What is strange is that it's was working well up to this morning ???

here is the error message:

System.Object {System.NullReferenceException} System.Object
StackTrace " at System.Data.DataTable.GetIndex(Int32[] indexDesc,
DataViewRowState recordStates, IFilter rowFilter)\r\n at
System.Data.DataColumn.get_SortIndex()\r\n at
System.Data.DataColumn.CheckUnique()\r\n at
System.Data.DataColumn.set_Unique(Boolean value)\r\n at
TNS.AdRequest.Core.DTNomenclatureLevel..ctor

Anyone have a clue?
thanks
mat