MVC :: Model Is Resolving Unpredictably?
Feb 23, 2011
The model for the View in question has two values that are being resolved as the same, when they're not. Here's the offending code:
[Code]....
They both resolve to 182. The first value is actually 2, and the second is 182. My first thought was that an inaccurate value had been assigned to ID, but I did a test, and here's where it got really weird. The test:
[Code]....
Results? 182, 2, 182. When the Model.ID was resolved inside of the Html.Hidden control, it resolved to 182. Outside of that control, it resolved correctly to 2. Absolutely no processing happens between these two being rendered - it's just as I've listed above.
So I did another test and stepped through the code. It turned out that the value wasn't being resolved incorrectly - just rendered incorrectly. When the execution gets to the hidden control with Model.ID, the value is correct (2). As I step through the entire view code, the value does not change. It remains as 2. Everything should be good. But when the view renders and I look at the source, it's been changed to 182. This is seriously messed up.
Another test - I changed the name of the control:
[Code]....
Now it resolves to 2, the correct value, and keeps that value when it renders. Somewhere the "ID" name was being overwritten. This still seems buggy to me. Just like the issue I posted with the Html.DropDownList, when stepping through the code the expected value is assigned, but when it rendered to the page, the value has been silently changed. The Html.DropDownList does something like this, as it tries to match up the selected option to the model, but the expected behavior would be to allow explicit code to override defaults. But no, the DropDownList just assigns the selected value to whichever item a condition tested true for, and then silently drops it in favor of matching from the model.
This silent failing from over-adherence to convention is driving me nuts. At least in the Html.DropDownList I have a good idea of where the problem is coming from. Though there might be another control with a name of "ID" on the page (the code shown is from a Partial View), the model is correctly resolving as it assigns these values. It assigns the correct values, and then renders incorrect values.
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[Code]....
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[Code]....
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[Code]....
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[Code]....
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[Code]....
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