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POHow do I handle null nested objects in RDLC report that is bound to custom assembly object datasource?
 

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  1. POHow do I handle null nested objects in RDLC report that is bound to custom assembly object datasource?
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    <p>I have an RDLC report that I am rendering directly to the Response Stream as PDF (rather than using the ReportViewer). In the code that renders the report, it's DataSource is bound to a List(Of ClassA) objects defined in a custom assembly. This seems to work for the most part. My problem is that I can't seem to handle the situation where a nested object is null. For example, given ClassA and ClassB (the nested object) defined as follows:</p> <pre><code> Public Class ClassA Public Id As Integer Public Name As String Public TheNestedObject As ClassB End Class Public Class ClassB Public Id As Integer Public Name As String Public TheParentObject As ClassA End Class </code></pre> <p>Whenever I try to conditionally display an "N/A" if Class B is null in my expression as follows:</p> <pre><code>=IIf(IsNothing(Fields!TheNestedObject.Value,"n/a", Fields!TheNestedObject.Value.Name)) </code></pre> <p>the report displays "#Error" if TheNestedObject is null. If TheNestedObject is not null, it correctly displays the Name.</p> <p>What am I doing wrong here?</p> <p>Thanks!!!</p>
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    1. USTodd Langdon
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