Question

.NET Generic collection

Asked by: deeznutz

When I try to run this query I get the error
Unable to cast object of type 'WhereEnumerableIterator`1[System.Collections.Generic.KeyValuePair`2[System.Int32,SoftwareHobbitData.clsMacroVariable]]' to type 'System.Collections.Generic.Dictionary`2[System.Int32,SoftwareHobbitData.clsMacroVariable][]'.

All I am trying to do is passed a filtered collection back.  What am I doing wrong?

ReadOnly Property ApplicationMacroVariables(ByVal iMacroID As Integer) As Dictionary(Of Integer, clsMacroVariable)
        Get
            Dim query As Dictionary(Of Integer, clsMacroVariable)()
 
            query = _ApplicationMacroVariable.Values.Where(Function(Variables) Variables.Value.iMacroID = iMacroID)
            Return query.Equals
        End Get
    End Property

                                  
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Asked On
2009-09-03 at 21:49:16ID24706814
Tags

Microsoft .net

Topics

.Net Application Servers

,

C# Programming Language

,

.NET

Participating Experts
2
Points
50
Comments
2

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Answers

 

by: daryalPosted on 2009-09-04 at 00:02:39ID: 25257305

Hello,
It is just a general information, but i think should be useful for you.

Dictionary<(Of <(TKey, TValue>)>) - Represents a collection of keys and values
KeyValuePair<(Of <(TKey, TValue>)>) - Defines a key/value pair that can be set or retrieved.

So you can see, KeyValuePair is basically the element of Dictionary

 

by: BusacPosted on 2009-09-04 at 09:36:29ID: 25261231

The Where extension method returns IEnumerable but you're trying to assign it to a variable of type Dictionary. Add a ToDictionary call to your statement:

query = _ApplicationMacroVariable.Values.Where(Function(Variables) Variables.Value.iMacroID = iMacroID).ToDictionary(Function(Variables) Variables.Value.iMacroID)

20120131-EE-VQP-002

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