Alejandro Bonilla's Blog

Unknown build error, ‘Item has already been added. Key in dictionary: ‘xxx’ Key being added: ‘xxx”

alejandrobog — Wed, 25 Nov 2009 01:35:03 +0000

I got this message today, it was interesting that it only happened the first time I try to build after a change in the code, and every time when I hit build for the second time it worked. The problem was that somehow the visual studio project file have duplicate items, in my case it was an image. So just edit the project file and get rid of the duplicate item, that’s it.

Pass your own arguments to the ClientValidationFunction in a CustomValidator

alejandrobog — Sun, 27 Sep 2009 05:45:16 +0000

When using a CustomValidator in asp.net you can specify a ClientValidationFunction to run on your client side. This function need to have 2 parameters (sender, args). The sender is the customvalidator control and the args is where you can specify the result of your validation(args.IsValid) and also access to the value of the control attached to you custom validator(args.Value). This is very useful for more complex validation on client side.

But what if you need to pass additional arguments. For example if you want to use the same client function for more than one control. Here is an option, you can add properties to your validation object, and then access them from the source parameter in your client function. Take a look at the example:

protected void Page_Load(object sender, EventArgs e)
{
Page.ClientScript.RegisterExpandoAttribute(CustomValidator1.ClientID, “RB1″, RadioButton1.ClientID, false);
Page.ClientScript.RegisterExpandoAttribute(CustomValidator1.ClientID, “RB2″, RadioButton2.ClientID, false);

Page.ClientScript.RegisterExpandoAttribute(CustomValidator2.ClientID, “RB1″, RadioButton3.ClientID, false);
Page.ClientScript.RegisterExpandoAttribute(CustomValidator2.ClientID, “RB2″, RadioButton4.ClientID, false);

Page.ClientScript.RegisterExpandoAttribute(CustomValidator3.ClientID, “RB1″, RadioButton5.ClientID, false);
Page.ClientScript.RegisterExpandoAttribute(CustomValidator3.ClientID, “RB2″, RadioButton6.ClientID, false);
}

LINQ to SQL — Can’t modify return type of stored procedure

alejandrobog — Wed, 23 Sep 2009 05:15:56 +0000

I’ve used store procedures in my data model several times without a problem until, I got this message. What I found out is that when you try to add a store procedure with a user defined data type you have this issue just change it to a non user defined data type and you would be able to specify a return type.

The custom tool msdiscocodegenerator failed – linq to sql data model

alejandrobog — Wed, 23 Sep 2009 04:50:50 +0000

Weird thing, when using a linq to sql data model with a partial class you may get the message “The custom tool msdiscocodegenerator failed” when using the custom tool. You may also loose your model auto-generated code when changing the data model. I dont know why but this happens if you have using statements before the name space definition. Check it out

namespace Backend.Entities – This works
{
using System;
using System.Collections.Generic;

public partial class EntitiesDataContext { …..

————————————————————————-
using System;
using System.Collections.Generic;
namespace Backend.Entities – This does’nt
{
public partial class EntitiesDataContext { …..

Silverlight datagrid change foreground color on VisualStateManager(mouseover, selected)

alejandrobog — Thu, 02 Jul 2009 02:43:27 +0000

Here is how you could change font properties using the VisualStateManager in a Silverlight datagrid.

The main problem is that when trying to edit a copy of the grid style the row content is presented as a DataGridCellPresenter, which doesn’t have any font properties. So what you can do is to wrap the DataGridCellPresenter into a contentControl so this way you can modify its properties and the DataGridCellPresenter would inherit them.

Here is an example:

<ContentControl x:Name=”contentControl” Foreground=”#FF000000″>
<Primitives:DataGridCellsPresenter x:Name=”CellsPresenter” Grid.Column=”1″
Primitives:DataGridFrozenGrid.IsFrozen=”True”/>
ContentControl>

<vsm:VisualState x:Name=”MouseOver”>
<Storyboard>
    <ColorAnimationUsingKeyFrames BeginTime=”00:00:00″ Duration=”00:00:00.0010000″
                                                                           Storyboard.TargetName=”contentControl”
                                                                           Storyboard.TargetProperty=”(Control.Foreground).(SolidColorBrush.Color)”>
      <SplineColorKeyFrame KeyTime=”00:00:00″ Value=”#FFE13710E”/>
    ColorAnimationUsingKeyFrames>
Storyboard>
vsm:VisualState><vsm:VisualState  x:Name=”Normal Selected”>
<Storyboard>
    <DoubleAnimationUsingKeyFrames Storyboard.TargetName=”BackgroundRectangle”
                                                                               Storyboard.TargetProperty=”Opacity”>
      <SplineDoubleKeyFrame KeyTime=”0″ Value=”1″/>
    DoubleAnimationUsingKeyFrames>
    <ColorAnimationUsingKeyFrames BeginTime=”00:00:00″ Duration=”00:00:00.0010000″
                                                                            Storyboard.TargetName=”contentControl”
                                                                            Storyboard.TargetProperty=”(Control.Foreground).(SolidColorBrush.Color)”>
      <SplineColorKeyFrame KeyTime=”00:00:00″ Value=”#FFE12222″/>
    ColorAnimationUsingKeyFrames>
Storyboard>
vsm:VisualState>