Adding DropDownListValue to ListView insert event

[stinkybee]

For a new site I am developing I have a listview which has a dropdownlist populated from another datasource. I need to pass the value of this dropdownlist to the insert event of the listview. I have done this previously in VB.NET with the following code so my question is simply, can anyone convert this into C#?

Sub insertRecipeIngredient(ByVal sender As Object, ByVal e As ListViewInsertEventArgs)
        Dim ddl As DropDownList
        ddl = e.Item.FindControl("dd_ingredientInsert")
        If Not IsDBNull(ddl) Then
            e.Values("ddl") = ddl.SelectedValue
            SqlDataSource4.InsertParameters(0).DefaultValue = ddl.SelectedValue
        End If
End Sub

Thanks

 

[jbenson001]

Google is your friend!
There are many on line converters that can help you:

http://www.developerfusion.com/tools/convert/vb-to-csharp/

 

[stinkybee]

Ok, thanks for the tip, I hadn't actually thought about converters. I have tried to put it through several but none seem to work. Here is the code after converting:

void insertRecipeIngredient(object sender, ListViewInsertEventArgs e) {
        DropDownList ddl;
        ddl = e.Item.FindControl("dd_ingredientInsert");
        if (!IsDBNull(ddl)) {
            e.Values["ddl"] = ddl.SelectedValue;
            SqlDataSource4.InsertParameters(0).DefaultValue = ddl.SelectedValue;
        }
}

it throws up this error:

Cannot implicitly convert type 'System.Web.UI.Control' to 'System.Web.UI.WebControls.DropDownList'.

on this line

ddl = e.Item.FindControl("dd_ingredientInsert")

Anyone else able to convert this?

 

[jmeckley]

that's right. you need to explicitly convert the object.

var ddl = e.Item.FindControl("dd_ingredientInsert") as DropDownList;
if(ddl is null) return;

var value = ddl.SelectedValue;
e.Values["ddl"] = value
SqlDataSource4.InsertParameters(0).DefaultValue = value;

Jason Meckley
Programmer

faq855-7190
faq732-7259

 

[stinkybee]

Thanks for that. Just needed to change the isdbnull check and change () for [] an now it works. The full code is:

void insertRecipeIngredient(object sender, ListViewInsertEventArgs e) {
   		
    var ddl = e.Item.FindControl("dd_ingredientInsert") as DropDownList;
	    if (System.Convert.IsDBNull(ddl)) return;
	    var value = ddl.SelectedValue;
	    e.Values["ddl"] = value;
	    SqlDataSource4.InsertParameters[0].DefaultValue = value;
	    
    }

Thanks again.

 

[jmeckley]

your logic will always be false DbNull is not null, they are 2 very different things. null is null; nothing; un-quantifiable. DbNull is an object that represents null from the database.

Jason Meckley
Programmer

faq855-7190
faq732-7259