difference between modelstate.addmodelerror with or without key in mvc.

Posted by Prabu_Spark under ASP.NET MVC on 7/15/2014 | Points: 10 | Views : 26259 | Status : [Member] | Replies : 2

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Hi sir,
Tell me the difference between modelstate.addmodelerror with or without key in mvc.

@Html.ValidationMessageFor(m=>m.username)

ModelState.AddModelError("username","Username cannot be empty")

ModelState.AddModelError("","Username cannot be empty")

With regards,
J.Prabu.
[Email:prbspark@gmail.com]

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Posted by: Bandi on: 7/15/2014 [Member] [MVP] Platinum | Points: 25

0	To display customized error message, 'Key' will be used, whereas without Key in the method will display generic error message... The below code adds a custom error message for each column that has database values different from what the user entered on the Edit page: if (databaseValues.Name != currentValues.Name) ModelState.AddModelError("Name", "Current value: " + databaseValues.Name); // ... A longer error message explains what happened and what to do about it: ModelState.AddModelError(string.Empty, "The record you attempted to edit " + "was modified by another user after you got the original value. The" + "edit operation was canceled and the current values in the database " + "have been displayed. If you still want to edit this record, click " + "the Save button again. Otherwise click the Back to List hyperlink."); reference: http://www.asp.net/mvc/tutorials/getting-started-with-ef-using-mvc/handling-concurrency-with-the-entity-framework-in-an-asp-net-mvc-application Mark This Response as Answer -- Chandu http://www.dotnetfunda.com/images/dnfmvp.gif Prabu_Spark, if this helps please login to Mark As Answer. \| Alert Moderator

To display customized error message, 'Key' will be used, whereas without Key in the method will display generic error message...

The below code adds a custom error message for each column that has database values different from what the user entered on the Edit page:


if (databaseValues.Name != currentValues.Name)
    ModelState.AddModelError("Name", "Current value: " + databaseValues.Name);
    // ...

A longer error message explains what happened and what to do about it:


ModelState.AddModelError(string.Empty, "The record you attempted to edit "
    + "was modified by another user after you got the original value. The"
    + "edit operation was canceled and the current values in the database "
    + "have been displayed. If you still want to edit this record, click "
    + "the Save button again. Otherwise click the Back to List hyperlink.");

reference:
http://www.asp.net/mvc/tutorials/getting-started-with-ef-using-mvc/handling-concurrency-with-the-entity-framework-in-an-asp-net-mvc-application

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Posted by: Bandi on: 7/15/2014 [Member] [MVP] Platinum | Points: 25

0	Refer these links http://stackoverflow.com/questions/5739362/modelstate-addmodelerror-how-can-i-add-an-error-that-isnt-for-a-property http://stackoverflow.com/questions/2818219/asp-net-mvc-html-validationsummarytrue-does-not-display-model-errors http://stackoverflow.com/questions/10406998/modelstate-addmodelerror-is-not-being-displayed-inside-my-view http://www.donnfelker.com/modelbinding-asp-net-mvc-and-multiple-field-validation/ Mark This Response as Answer -- Chandu http://www.dotnetfunda.com/images/dnfmvp.gif Prabu_Spark, if this helps please login to Mark As Answer. \| Alert Moderator

Refer these links
http://stackoverflow.com/questions/5739362/modelstate-addmodelerror-how-can-i-add-an-error-that-isnt-for-a-property
http://stackoverflow.com/questions/2818219/asp-net-mvc-html-validationsummarytrue-does-not-display-model-errors
http://stackoverflow.com/questions/10406998/modelstate-addmodelerror-is-not-being-displayed-inside-my-view
http://www.donnfelker.com/modelbinding-asp-net-mvc-and-multiple-field-validation/

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