c# - Why is a ArgumentOutOfRangeException being thrown when datatemplate is not the current one being used -


i using data template selector, shown below: -

public class exampletemplateselector : datatemplateselector {     public datatemplate foo { get; set; }     public datatemplate bar { get; set; }      public override datatemplate selecttemplate(object item, dependencyobject container)     {         var foo = item footype;         return foo != null ? foo : bar;     } }

the xaml using being: -

<mtf:detailtemplateselector   foo="{staticresource foo}"   bar="{staticresource bar}"   x:key="baz" />

the data template foo is: -

<datatemplate x:key="foo">     <textbox text="{binding relativesource={relativesource findancestor, ancestortype={x:type usercontrol}},                             path=datacontext.detailitems[2].field.value" /> </datatemplate>

using following choose template: -

<contentcontrol content="{binding set}" contenttemplateselector="{staticresource baz}" />

the data template bar case when know detailitems[2] go out of range use template selector return data template doesn't have parameters , returns, let's text="qux".

the display not problem , functionality working fine, i'm concerned information given me in debug output seeing exception.

why exception being thrown though datatemplate uses index not returned?

i can provide more information if necessary i'm expecting given information enough without having see data source.


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