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The following 6 validation errors were detected: + Target object: Product, Member: DateDue - Detected by: OrCompositeValidator - Tag value: Date Due - Validated value was: '23/11/2010 13:45:41' - Message: 'Date Due must be between today and six months time.' + Nested validators: - Detected by: NotNullValidator - Validated value was: '23/11/2010 13:45:41' - Message: 'Value can be NULL or a date.' - Detected by: RelativeDateTimeValidator - Validated value was: '23/11/2010 13:45:41' - Message: 'Value can be NULL or a date.' + Target object: Product, Member: Description - Detected by: OrCompositeValidator - Validated value was: '-' - Message: 'Description can be NULL or a string value.' + Nested validators: - Detected by: StringLengthValidator - Validated value was: '-' - Message: 'Description must be between 5 and 100 characters.' - Detected by: NotNullValidator

[global::System.Data.Linq.Mapping.ColumnAttribute(Storage="_URL", DbType="NVarChar(100) NOT NULL", CanBeNull=false)] [System.ComponentModel.DataAnnotations.RegularExpression ("http(s) ://([\\w-]+\\.)+[\\w-]+(/[\\w- ./ %&=]*) ")] public string URL { get { return this._URL; } set { if ((this._URL != value)) { this.OnURLChanging(value); this.SendPropertyChanging(); this._URL = value; this.SendPropertyChanged("URL"); this.OnURLChanged(); } } }

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In other cases, the components involved may be much more coarse-grained For example, a common and effective approach to building large complex applications is to divide the functionality into discrete modules It is desirable to minimize the use of static references between these modules so that the modules can be independently developed, tested, deployed, and updated However, these modules will often be required to communicate in a loosely coupled fashion with other modules, and with the hosting application itself The Prism Library supports the following loosely coupled communication approaches: Commanding Use this when there is an expectation of immediate action from the user interaction Region context Use this to provide contextual information between the host and views in the host s region This approach is somewhat similar to the DataContext, but it does not rely on it Shared services.

5 . . Run the site . Go to the DotNetLinks page and try to edit one of the links . You are presented with the DotNetLinks edit page . Type an invalid URL in the edit box . Click the Update link and watch the built-in regular expression validator fire, just as shown in 6, Control Potpourri, and as illustrated in the following graphic . This happens because the URL property in the data model throws an exception when a value not matching the regular expression defined in the attribute is set .

6 . . To see where the built-in RegularExpressionValidator is set up, open the file Text_Edit .ascx, which is in the DynamicData\FieldTemplates folder in Server Explorer . You ll see the following code:

- Validated value was: '-' - Message: 'Value can be NULL.' ... ... + Target object: Product, Member: ProductType - Detected by: EnumConversionValidator - Tag value: Product Type - Validated value was: 'FurryThings' - Message: 'Product Type must be a value from the 'ProductType' enumeration.'

<%@ Control Language="C#" CodeBehind="Text_Edit.ascx.cs" Inherits="DynamicDataLinqToSQLSite.Text_EditField" %> <asp:TextBox ID="TextBox1" runat="server" Text='<%# FieldValueEditString %>' CssClass="DDTextBox"></asp:TextBox> <asp:RequiredFieldValidator runat="server" ID="RequiredFieldValidator1" CssClass="DDControl DDValidator" ControlToValidate="TextBox1" Display="Dynamic" Enabled="false" /> <asp:RegularExpressionValidator runat="server" ID="RegularExpressionValidator1" CssClass="DDControl DDValidator" ControlToValidate="TextBox1" Display="Dynamic" Enabled="false" /> <asp:DynamicValidator runat="server" ID="DynamicValidator1" CssClass="DDControl DDValidator" ControlToValidate="TextBox1" Display="Dynamic" />

Callers can call a method on the service, which raises an event to the receiver of the message Use this if none of the preceding is applicable Event aggregation Use this for communication across view models, presenters, or controllers when there is not a direct action-reaction expectation..

Voila! The editing facilities of the page are controlled by a user control!

You can see that this shows the target object type and the name of the member of the target object that was being validated It also shows the type of the validator that performed the operation, the Tag property values, and the validation error message Notice also that the output includes the validation results from the validators nested within the two OrCompositeValidator validators To achieve this, you must iterate recursively through the ValidationResults instance because it contains nested entries for the composite validators The code we used also contains a somewhat contrived feature: to be able to show the value being validated, some examples that use this routine include the validated value at the start of the message using the {0} token in the form: [{0}] validation error message.

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