Unable to invoke protected method of DataGrid in Paint method

[Kais4U]

Hi, I found a code on net which allows multiline text in the datagrid cell. The sample code wasin VB.net, I just converted it to C#. Now the problem is the GetMethod is returning me null instead of an object. The code snippet is attached below MethodInfo mi = dg.GetType().GetMethod("get_DataGridRows", BindingFlags.FlattenHierarchy | BindingFlags.IgnoreCase | BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Static); Array dgRowArray = (Array) mi.Invoke(this.dg, null); the mi object is not getting created. It always says undefined. Am executing the above code in the overrided paint event of the datagrid. Can anyone help me out Any help is highly appreciated. Thanks in advance Regards, Kais

[Martin 0]

Hello Kais, I also had problems with MethodInfo. So I changed my code too InvokeRequired, by using a delegate. private delegate void OnPaintDelegate(System.Windows.Forms.PaintEventArgs e); protected override void OnPaint(System.Windows.Forms.PaintEventArgs e) { if(InvokeRequired) { OnPaintDelegate(new OnPaintDelegate(_OnPaint), new object [] { e } ); return; } //Your code } Hope that helps you. All the best, Martin

[Kais4U]

Hi Martin, Where do we need to define "InvokeRequired" variable? Also i have override the paint method which has 7 parameters. Is that an issue? Please guide me if am wrong. I want to make this work. Regards, Kais

[Martin 0]

Hi Kais, InvokeRequired is a member of System.Windows.Forms.Control. You can have as much parameters as you whant, as long as your delagates has the same. private delegate void xxxDelegate(..., ..., ..., ...); Hope that helps you! All the best, Martin

[Kais4U]

Hi Martin, Thanks for your prompt reply. I added the peice of your code in my customized datagrid class which inherits from DataGrid. Now it throws me the following errors The name '_OnPaint' does not exist in the class or namespace CustomControl.CustomGrid.CustomDataGrid' CustomControl.CustomGrid.CustomDataGrid.OnPaintDelegate' denotes a 'class' which is not valid in the given context This might be a stupid thing i am asking. The delegate needs to be wrapped with the method. Where do i need to assign the method for it? Thanks in advance Regards, Kais

[Martin 0]

Sorry, Was my mistake! private delegate void get_DataGridRowsDelegate(..., ..., ..., ...); protected override void get_DataGridRows(..., ..., ..., ...) { if(InvokeRequired) { get_DataGridRowsDelegate(new get_DataGridRowsDelegate(get_DataGridRows), new object [] { ..., ..., ..., ..., } ); return; } //Your code } The method has to be your get_DataGridRows Method you asked for. With all the parameters you had. If its not working, please post the code here! Martin -- modified at 8:08 Monday 3rd July, 2006

[Martin 0]

Was a little confused before. I mixed my code to yours and forgot your actual question.

[Kais4U]

Martin, Thats ok. But get_DataGridRows method is not available for override. How will this work? Regards, Kais

[Martin 0]

In your case, you can create Method like you had before. private void get_DataGridRows(...... ; just insert code in your Method. Martin Please give me feedback, if it works.

[Martin 0]

Again, it was code from my project.

[Kais4U]

Ok let me try out. I need to leave for the day now. Catch you tomorrow.. Thank you very much for your suggestion and time. :) Regards, Kais

[Kais4U]

hi Martin, In meanwhile is it possible for you to send me the complete sample code. I would be very greatful for you if i can get the sample code. Thanks for all your help Regards Kais