Fix 'IEnumerable' Key Error in ASP.NET MVC

├Źndice
  1. Introduction
  2. Solution
  3. Conclusion

Introduction

When working with ASP.NET MVC, you may encounter the error message 'IEnumerable<SelectListItem> has no key defined'. This error occurs when you try to bind a dropdown list to a model property using the SelectList class, but you forget to set the 'Value' property of each SelectListItem object. In this article, we will discuss how to fix this error.

Solution

To fix the 'IEnumerable<SelectListItem> has no key defined' error, you need to make sure that each SelectListItem object in the SelectList has a value set for its 'Value' property. This value will be used as the key when the form is submitted.

Here is an example code snippet that demonstrates how to create a SelectList with a list of SelectListItem objects:


List<SelectListItem> items = new List<SelectListItem>();

items.Add(new SelectListItem { Text = "Item 1", Value = "1" });
items.Add(new SelectListItem { Text = "Item 2", Value = "2" });
items.Add(new SelectListItem { Text = "Item 3", Value = "3" });

ViewBag.Items = new SelectList(items, "Value", "Text");

In this example, we create a list of SelectListItem objects and set the 'Value' property for each item. Then, we create a SelectList object using this list and set the 'Value' and 'Text' properties to 'Value' and 'Text', respectively.

Finally, we store the SelectList object in the ViewBag, which can be used to bind the dropdown list to a model property in the View.

Conclusion

The 'IEnumerable<SelectListItem> has no key defined' error in ASP.NET MVC occurs when you forget to set the 'Value' property of each SelectListItem object in a SelectList. By following the solution outlined in this article, you can fix this error and successfully bind a dropdown list to a model property. Remember to always set the 'Value' property for each SelectListItem object to avoid this error in the future.

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