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//------------------------------------------------------------------------------
// <copyright file="ModelErrorMessage.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web.UI.WebControls {
using System.ComponentModel;
using System.Linq;
using System.Web;
using System.Web.ModelBinding;
/// <summary>
/// Displays the first model error for a given key from the page's model state
/// </summary>
[
ToolboxData("<{0}:ModelErrorMessage runat=\"server\" Key=\"ModelStateKey\"></{0}:ModelErrorMessage>"),
DefaultProperty("Key"),
ParseChildren(true),
PersistChildren(false)
]
public class ModelErrorMessage : Label {
[
Themeable(false),
WebCategory("Behavior"),
WebSysDescription(SR.ModelErrorMessage_ModelStateKey),
DefaultValue("")
]
public string ModelStateKey {
get {
object o = ViewState["ModelStateKey"];
return ((o == null) ? String.Empty : (string)o);
}
set {
ViewState["ModelStateKey"] = value;
}
}
[
DefaultValue(""),
IDReferenceProperty,
WebCategory("Behavior"),
WebSysDescription(SR.ModelErrorMessage_AssociatedControlID),
Themeable(false)
]
public override string AssociatedControlID {
get {
return base.AssociatedControlID;
}
set {
base.AssociatedControlID = value;
}
}
[
WebCategory("Behavior"),
Themeable(false),
DefaultValue(false),
WebSysDescription(SR.ModelErrorMessage_SetFocusOnError)
]
public bool SetFocusOnError {
get {
object o = ViewState["SetFocusOnError"];
return ((o == null) ? false : (bool)o);
}
set {
ViewState["SetFocusOnError"] = value;
}
}
[
Browsable(false),
EditorBrowsable(EditorBrowsableState.Never),
PersistenceMode(PersistenceMode.Attribute)
]
public override string Text {
// We don't want the Text property exposed to the developer as we're going to set it
// ourselves to the value from the model state. We don't want to store it in ViewState
// because we want it re-evaluated on every render anyway, so storing in ViewState is
// just overhead.
get;
set;
}
protected internal override void OnPreRender(EventArgs e) {
base.OnPreRender(e);
ModelState modelState;
if (Page != null && Page.ModelState.TryGetValue(ModelStateKey, out modelState)) {
ModelError error = modelState.Errors.FirstOrDefault(modelError => !String.IsNullOrEmpty(modelError.ErrorMessage));
if (error != null) {
Text = HttpUtility.HtmlEncode(error.ErrorMessage);
// Render the script to set focus if there is a model error for the specified key
if (SetFocusOnError) {
var validateId = AssociatedControlID;
if (!String.IsNullOrEmpty(validateId)) {
var control = FindControl(validateId);
if (control != null) {
validateId = control.ClientID;
}
Page.SetValidatorInvalidControlFocus(validateId);
}
}
}
}
}
}
}
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