DbParameterHelper.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / EntityClient / DbParameterHelper.cs / 1305376 / DbParameterHelper.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner  [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

 
namespace System.Data.EntityClient {

    using System;
    using System.ComponentModel; 
    using System.Data;
    using System.Data.Common; 
    using System.Globalization; 

    public sealed partial class EntityParameter : DbParameter { 
        private object _value;

        private object _parent;
 
        private ParameterDirection _direction;
        private int? _size; 
 

        private string _sourceColumn; 
        private DataRowVersion _sourceVersion;
        private bool _sourceColumnNullMapping;

        private bool? _isNullable; 

        private object _coercedValue; 
 
        private EntityParameter(EntityParameter source) : this() {
            ADP.CheckArgumentNull(source, "source"); 

            source.CloneHelper(this);

            ICloneable cloneable = (_value as ICloneable); 
            if (null != cloneable) {
                _value = cloneable.Clone(); 
            } 
        }
 
        private object CoercedValue {
            get {
                return _coercedValue;
            } 
            set {
                _coercedValue = value; 
            } 
        }
 
        [
        RefreshProperties(RefreshProperties.All),
        System.Data.ResCategoryAttribute(Res.DataCategory_Data),
        System.Data.ResDescriptionAttribute(Res.DbParameter_Direction), 
        ]
        override public ParameterDirection Direction { 
            get { 
                ParameterDirection direction = _direction;
                return ((0 != direction) ? direction : ParameterDirection.Input); 
            }
            set {
                if (_direction != value) {
                    switch (value) { 
                    case ParameterDirection.Input:
                    case ParameterDirection.Output: 
                    case ParameterDirection.InputOutput: 
                    case ParameterDirection.ReturnValue:
                        PropertyChanging(); 
                        _direction = value;
                        break;
                    default:
                        throw ADP.InvalidParameterDirection(value); 
                    }
                } 
            } 
        }
 
        override public bool IsNullable {
            get {
                bool result = this._isNullable.HasValue ? this._isNullable.Value : true;
                return result; 
            }
            set { 
                _isNullable = value; 
            }
        } 

        internal int Offset {
            get {
                return 0; 
            }
        } 
 
        [
        System.Data.ResCategoryAttribute(Res.DataCategory_Data), 
        System.Data.ResDescriptionAttribute(Res.DbParameter_Size),
        ]
        override public int Size {
            get { 
                int size = _size.HasValue ? _size.Value : 0;
                if (0 == size) { 
                    size = ValueSize(Value); 
                }
                return size; 
            }
            set {
                if (!_size.HasValue || _size.Value != value) {
                    if (value < -1) { 
                        throw ADP.InvalidSizeValue(value);
                    } 
                    PropertyChanging(); 
                    if (0 == value) {
                        _size = null; 
                    }
                    else {
                        _size = value;
                    } 
                }
            } 
        } 

        private void ResetSize() { 
            if (_size.HasValue) {
                PropertyChanging();
                _size = null;
            } 
        }
 
        private bool ShouldSerializeSize() { 
            return (_size.HasValue && _size.Value != 0);
        } 

        [
        System.Data.ResCategoryAttribute(Res.DataCategory_Update),
        System.Data.ResDescriptionAttribute(Res.DbParameter_SourceColumn), 
        ]
        override public string SourceColumn { 
            get { 
                string sourceColumn = _sourceColumn;
                return ((null != sourceColumn) ? sourceColumn : ADP.StrEmpty); 
            }
            set {
                _sourceColumn = value;
            } 
        }
 
        public override bool SourceColumnNullMapping { 
            get {
                return _sourceColumnNullMapping; 
            }
            set {
                _sourceColumnNullMapping = value;
            } 
        }
 
        [ 
        System.Data.ResCategoryAttribute(Res.DataCategory_Update),
        System.Data.ResDescriptionAttribute(Res.DbParameter_SourceVersion), 
        ]
        override public DataRowVersion SourceVersion {
            get {
                DataRowVersion sourceVersion = _sourceVersion; 
                return ((0 != sourceVersion) ? sourceVersion : DataRowVersion.Current);
            } 
            set { 
                switch(value) {
                case DataRowVersion.Original: 
                case DataRowVersion.Current:
                case DataRowVersion.Proposed:
                case DataRowVersion.Default:
                    _sourceVersion = value; 
                    break;
                default: 
                    throw ADP.InvalidDataRowVersion(value); 
                }
            } 
        }

        private void CloneHelperCore(EntityParameter destination) {
            destination._value                     = _value; 

            destination._direction                 = _direction; 
            destination._size                      = _size; 

            destination._sourceColumn              = _sourceColumn; 
            destination._sourceVersion             = _sourceVersion;
            destination._sourceColumnNullMapping   = _sourceColumnNullMapping;
            destination._isNullable                = _isNullable;
        } 

        internal void CopyTo(DbParameter destination) { 
            ADP.CheckArgumentNull(destination, "destination"); 
            CloneHelper((EntityParameter)destination);
        } 

        internal object CompareExchangeParent(object value, object comparand) {

 

 
            object parent = _parent; 
            if (comparand == parent) {
                _parent = value; 
            }
            return parent;
        }
 
        internal void ResetParent() {
            _parent = null; 
        } 

        override public string ToString() { 
            return ParameterName;
        }

        private byte ValuePrecisionCore(object value) { 
            if (value is Decimal) {
                return ((System.Data.SqlTypes.SqlDecimal)(Decimal) value).Precision; 
            } 
            return 0;
        } 

        private  byte ValueScaleCore(object value) {
            if (value is Decimal) {
                return (byte)((Decimal.GetBits((Decimal)value)[3] & 0x00ff0000) >> 0x10); 
            }
            return 0; 
        } 

        private  int ValueSizeCore(object value) { 
            if (!ADP.IsNull(value)) {
                string svalue = (value as string);
                if (null != svalue) {
                    return svalue.Length; 
                }
                byte[] bvalue = (value as byte[]); 
                if (null != bvalue) { 
                    return bvalue.Length;
                } 
                char[] cvalue = (value as char[]);
                if (null != cvalue) {
                    return cvalue.Length;
                } 
                if ((value is byte) || (value is char)) {
                    return 1; 
                } 
            }
            return 0; 
        }
    }
}
 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu

Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
DbParameterHelper.cs source code in C# .NET

Source code for the .NET framework in C#

Code:

Link Menu
