DataColumnPropertyDescriptor.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / DataColumnPropertyDescriptor.cs / 1 / DataColumnPropertyDescriptor.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
// [....]
// [....] 
//----------------------------------------------------------------------------- 

namespace System.Data { 
    using System.Diagnostics;
    using System.ComponentModel;
    using System.Data.Common;
 
    internal sealed class DataColumnPropertyDescriptor : PropertyDescriptor {
 
        DataColumn column; 

        internal DataColumnPropertyDescriptor(DataColumn dataColumn) : base(dataColumn.ColumnName, null) { 
            this.column = dataColumn;
        }

        public override AttributeCollection Attributes { 
            get {
                if (typeof(System.Collections.IList).IsAssignableFrom(this.PropertyType)) { 
                    Attribute[] attrs = new Attribute[base.Attributes.Count + 1]; 
                    base.Attributes.CopyTo(attrs, 0);
                    // we don't want to show the columns which are of type IList in the designer 
                    attrs[attrs.Length - 1] = new ListBindableAttribute(false);
                    return new AttributeCollection(attrs);
                } else {
                    return base.Attributes; 
                }
            } 
        } 

        internal DataColumn Column { 
            get {
                return column;
            }
        } 

        public override Type ComponentType { 
            get { 
                return typeof(DataRowView);
            } 
        }

        public override bool IsReadOnly {
            get { 
                return column.ReadOnly;
            } 
        } 

        public override Type PropertyType { 
            get {
                return column.DataType;
            }
        } 

        public override bool Equals(object other) { 
            if (other is DataColumnPropertyDescriptor) { 
                DataColumnPropertyDescriptor descriptor = (DataColumnPropertyDescriptor) other;
                return(descriptor.Column == Column); 
            }
            return false;
        }
 
        public override Int32 GetHashCode() {
            return Column.GetHashCode(); 
        } 

        public override bool CanResetValue(object component) { 
            DataRowView dataRowView = (DataRowView) component;
            if (!column.IsSqlType)
            	return (dataRowView.GetColumnValue(column) != DBNull.Value);
            return (!DataStorage.IsObjectNull(dataRowView.GetColumnValue(column))); 
        }
 
        public override object GetValue(object component) { 
            DataRowView dataRowView = (DataRowView) component;
            return dataRowView.GetColumnValue(column); 
        }

        public override void ResetValue(object component) {
            DataRowView dataRowView = (DataRowView) component; 
            dataRowView.SetColumnValue(column, DBNull.Value);// no need to ccheck for the col type and set Sql...Null!
        } 
 
        public override void SetValue(object component, object value) {
            DataRowView dataRowView = (DataRowView) component; 
            dataRowView.SetColumnValue(column, value);
            OnValueChanged(component, EventArgs.Empty);
        }
 
        public override bool ShouldSerializeValue(object component) {
            return false; 
        } 

 		public override bool IsBrowsable { 
			get {
				return (column.ColumnMapping == System.Data.MappingType.Hidden ? false : base.IsBrowsable);
			}
 		} 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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