Not getting validation Error Messages from DataAnnotation Validations

问题

I am have a simple model class for Login, with few DataAnnotation Validations

Public Class LoginUser
    <Required()> _
    Public Property UserName As String

    <Required()> _
    <StringLength(8)> _
    Public Property Password As String

End Class

View is a partial View and is as follows:

<% Using (Html.BeginForm("Login", "User", FormMethod.Post))%>
<% Html.EnableClientValidation()%>

<%= Html.ValidationSummary() %>
<table ID="loginTable" runat="server">
    <tr>
        <td>
            <%= Html.LabelFor(Function(x) x.UserName)%>
        </td>
    </tr>
    <tr>
        <td>
            <%= Html.TextBoxFor(Function(x) x.UserName)%>
            <%= Html.ValidationMessageFor(Function(x) x.UserName) %>
        </td>
    </tr>
    <tr>
        <td>
            <%= Html.LabelFor(Function(x) x.Password)%>
        </td>
    </tr>
    <tr>
        <td>
            <%= Html.TextBoxFor(Function(x) x.Password)%>
            <%= Html.ValidationMessageFor(Function(x) x.Password)%>
        </td>
    </tr>
    <tr>
        <td>
            <input type="submit" value="Login" />
        </td>
    </tr>
</table>
<% End Using%>   

I believe I have done all the things needed for validation message to show up, but it does not, neither does clientside validation. I have also included the following scripts, on the head region of Master Page

<script src="../../Scripts/jquery-1.4.1.min.js" type="text/javascript"></script>
<script src="../../Scripts/jquery.validate.min.js" type="text/javascript"></script> 
<script src="../../Scripts/MicrosoftAjax.js" type="text/javascript"></script>
<script src="../../Scripts/MicrosoftMvcAjax.js" type="text/javascript"></script>
<script src="../../Scripts/MicrosoftMvcValidation.js" type="text/javascript"></script>

What is causing this problem? And what is the solution?

回答1:

you need to add some error messages to your annotation

Public Class LoginUser
    <Required()(ErrorMessage:="Username is required.")> _
    Public Property UserName As String

    <Required(ErrorMessage:="Pssword is required.")> _
    <StringLength(8)> _
    Public Property Password As String

End Class

not sure if it will make a difference but try adding true like this

    <%= Html.ValidationSummary(true)%>
<% Html.EnableClientValidation(true)%>

来源：https://stackoverflow.com/questions/12102433/not-getting-validation-error-messages-from-dataannotation-validations