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Iterate a structure to get the names and values of its members

Posted on 2014-01-23
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Last Modified: 2014-01-23
I want to iterate a structure in order to build a string out of the name and value of its members. The following code seems to be what I need but the .GetValue method expects an object parameter that I don't understand:

Dim sb As New System.Text.StringBuilder
Dim t As Type = GetType(myStructure)
For Each f As System.Reflection.FieldInfo In t.GetFields
        sb.AppendLine(f.Name & " = " & f.GetValue(??) & ", ")
Next f

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Question by:TimHudspith
4 Comments
 
LVL 40

Accepted Solution

by:
Jacques Bourgeois (James Burger) earned 1600 total points
ID: 39804552
In order to get a value, you need to have an object. The parameter you are wondering about is simply the instance that contains the values.

Supposing that your structure has 2 simple fields x and y, the following code would retrieve the values in object o:

Dim sb As New System.Text.StringBuilder
Dim o As MyStructure
		o.x = 10
		o.y = 20
Dim t As Type = GetType(MyStructure)

For Each f As System.Reflection.FieldInfo In t.GetFields
	sb.AppendLine(f.Name & " = " & f.GetValue(o).ToString & ", ")
Next f

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Assisted Solution

by:Fernando Soto
Fernando Soto earned 200 total points
ID: 39804711
Hi TimHudspith;

This should give you what you need.

Imports System.Reflection

Dim sb As New System.Text.StringBuilder
' Where myStructureTypeName is the Type name of the structure and NOT an instance variable name
Dim t As Type = GetType(myStructureTypeName)

For Each f As FieldInfo In t.GetFields((BindingFlags.Public Or BindingFlags.Instance))
        ' Where myStructureInstanceName is the instance variable of that structure.
        sb.AppendLine(f.Name & " = " & f.GetValue(myStructureInstanceName) & ", ")
Next f

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LVL 28

Assisted Solution

by:Ark
Ark earned 200 total points
ID: 39805503
Just a small addition - for shared members you can use Nothing instead of actual instance
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Author Comment

by:TimHudspith
ID: 39805646
Got it. Thanks all.
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