81 lines
3.5 KiB
C#
81 lines
3.5 KiB
C#
namespace System.Web.UI.WebControls {
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using System;
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using System.Web.ModelBinding;
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/// <summary>
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/// Used to invoke <see cref='System.Web.UI.Page.UpdateModel' />/<see cref='System.Web.UI.Page.TryUpdateModel' />
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/// methods where <see cref='System.Web.UI.Page' /> is directly not accessible.
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/// An example is a custom class defining the Select/Update/Delete/InsertMethod properties for
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/// data binding can have a parameter of type <see cref='System.Web.UI.WebControls.ModelMethodContext' />
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/// in the above methods and use it to invoke the above methods. Alternately instead of a method parameter,
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/// <see cref='System.Web.UI.WebControls.ModelMethodContext.Current' /> can also be used within the
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/// Select/Update/Delete/InsertMethod code to invoke TryUpdateModel/UpdateModel methods.
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/// </summary>
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public class ModelMethodContext {
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private Page _page;
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public ModelMethodContext(Page page) {
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if (page == null) {
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throw new ArgumentNullException("page");
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}
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_page = page;
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}
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public ModelStateDictionary ModelState {
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get {
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return _page.ModelState;
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}
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}
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/// <summary>
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/// Gets the ModelMethodContext corresponding to the <see cref='System.Web.UI.Page' /> from <see cref='System.Web.HttpContext.Current' />.
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/// Can be null when the current request is not for a <see cref='System.Web.UI.Page' />.
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/// </summary>
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public static ModelMethodContext Current {
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get {
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Page page = HttpContext.Current.Handler as Page;
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if (page != null) {
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return new ModelMethodContext(page);
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}
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return null;
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}
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}
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/// <summary>
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/// Updates the model object from the values within a databound control. This must be invoked
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/// within the Select/Update/Delete/InsertMethods used for data binding.
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/// Throws an exception if the update fails.
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/// </summary>
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public virtual void UpdateModel<TModel>(TModel model) where TModel : class {
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_page.UpdateModel<TModel>(model);
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}
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/// <summary>
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/// Updates the model object from the values provided by given valueProvider.
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/// Throws an exception if the update fails.
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/// </summary>
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public virtual void UpdateModel<TModel>(TModel model, IValueProvider valueProvider) where TModel : class {
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_page.UpdateModel<TModel>(model, valueProvider);
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}
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/// <summary>
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/// Attempts to update the model object from the values provided by given valueProvider.
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/// </summary>
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/// <returns>True if the model object is updated succesfully with valid values. False otherwise.</returns>
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public virtual bool TryUpdateModel<TModel>(TModel model) where TModel : class {
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return _page.TryUpdateModel<TModel>(model);
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}
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/// <summary>
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/// Attempts to update the model object from the values within a databound control. This
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/// must be invoked within the Select/Update/Delete/InsertMethods used for data binding.
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/// </summary>
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/// <returns>True if the model object is updated succesfully with valid values. False otherwise.</returns>
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public virtual bool TryUpdateModel<TModel>(TModel model, IValueProvider valueProvider) where TModel : class {
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return _page.TryUpdateModel<TModel>(model, valueProvider);
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}
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}
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}
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