DataTemplate.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / DataTemplate.cs / 1 / DataTemplate.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// Description: DataTemplate describes how to display a single data item. 
// 
// Specs:       [....]/coreui/Specs%20%20Property%20Engine/Styling%20Revisited.doc
// 
//---------------------------------------------------------------------------

using System.ComponentModel;
using System.Windows.Controls; 
using System.Windows.Markup;
 
namespace System.Windows 
{
    ///  
    ///     DataTemplate describes how to display a single data item.
    /// 
    public class DataTemplate : FrameworkTemplate
    { 
        #region Constructors
 
        //------------------------------------------------------------------- 
        //
        //  Constructors 
        //
        //-------------------------------------------------------------------

        ///  
        ///     DataTemplate Constructor
        ///  
        public DataTemplate() 
        {
        } 

        /// 
        ///     DataTemplate Constructor
        ///  
        public DataTemplate(object dataType)
        { 
            Exception ex = TemplateKey.ValidateDataType(dataType, "dataType"); 
            if (ex != null)
                throw ex; 

            _dataType = dataType;
        }
 
        #endregion Constructors
 
        #region Public Properties 

        //-------------------------------------------------------------------- 
        //
        //  Public Properties
        //
        //------------------------------------------------------------------- 

        ///  
        ///     DataType for this DataTemplate.  If the template is intended 
        ///     for object data, this is the Type of the data.  If the
        ///     template is intended for XML data, this is the tag name 
        ///     of the data (i.e. a string).
        /// 
        [DefaultValue(null)]
        public object DataType 
        {
            get {  return _dataType; } 
            set 
            {
                Exception ex = TemplateKey.ValidateDataType(value, "value"); 
                if (ex != null)
                    throw ex;

                CheckSealed(); 
                _dataType = value;
            } 
        } 

        ///  
        ///     Collection of Triggers
        /// 
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
        [DependsOn("VisualTree")] 
        public TriggerCollection Triggers
        { 
            get 
            {
                if (_triggers == null) 
                {
                    _triggers = new TriggerCollection();

                    // If the template has been sealed prior to this the newly 
                    // created TriggerCollection also needs to be sealed
                    if (IsSealed) 
                    { 
                        _triggers.Seal();
                    } 
                }
                return _triggers;
            }
        } 

        #endregion PublicProperties 
 
        #region Internal Properties
 
        //--------------------------------------------------------------------
        //
        //  Internal Properties
        // 
        //--------------------------------------------------------------------
 
        // 
        //  TargetType for DataTemplate. This is override is
        //  so FrameworkTemplate can see this property. 
        //
        internal override Type TargetTypeInternal
        {
            get {  return DefaultTargetType; } 
        }
 
        // Subclasses must provide a way for the parser to directly set the 
        // target type.  For DataTemplate, this is not allowed.
        internal override void SetTargetTypeInternal(Type targetType) 
        {
            throw new InvalidOperationException(SR.Get(SRID.TemplateNotTargetType));
        }
 
        //
        //  DataType for DataTemplate. This is override is 
        //  so FrameworkTemplate can see this property. 
        //
        internal override object DataTypeInternal 
        {
            get {  return DataType; }
        }
 
        //
        //  Collection of Triggers for a DataTemplate. This is 
        //  override is so FrameworkTemplate can see this property. 
        //
        internal override TriggerCollection TriggersInternal 
        {
            get { return Triggers; }
        }
 
        // Target type of DataTrigger is ContentPresenter
        static internal Type DefaultTargetType 
        { 
            get { return typeof(ContentPresenter); }
        } 

        #endregion Internal Properties

        #region Protected Methods 

        //------------------------------------------------------------------- 
        // 
        //  Protected Methods
        // 
        //--------------------------------------------------------------------

        /// 
        ///     Validate against the following rules 
        ///     1. Must have a non-null feTemplatedParent
        ///     2. A DataTemplate must be applied to a ContentPresenter 
        ///  
        protected override void ValidateTemplatedParent(FrameworkElement templatedParent)
        { 
            // Must have a non-null feTemplatedParent
            if (templatedParent == null)
            {
                throw new ArgumentNullException("templatedParent"); 
            }
 
            // A DataTemplate must be applied to a ContentPresenter 
            if (!(templatedParent is ContentPresenter))
            { 
                throw new ArgumentException(SR.Get(SRID.TemplateTargetTypeMismatch, "ContentPresenter", templatedParent.GetType().Name));
            }
        }
 
        #endregion Protected Methods
 
        #region Data 

        private object                  _dataType; 
        private TriggerCollection       _triggers;

        #endregion Data
    } 
}
 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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DataTemplate.cs source code in C# .NET

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