DbParameterHelper.cs source code in C# .NET

                        Code:
                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / ProviderBase / DbParameterHelper.cs / 1 / DbParameterHelper.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
//-----------------------------------------------------------------------------
 
namespace NAMESPACE { 

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

#if WINFSInternalOnly 
    internal 
#else
    public 
#endif
    sealed partial class PARAMETEROBJECTNAME : DbParameter { // V1.2.3300
        private object _value;
 
        private object _parent;
 
        private ParameterDirection _direction; 
        private int _size;
#if USEOFFSET 
        private int _offset;
#endif
        private string _sourceColumn;
        private DataRowVersion _sourceVersion; 
        private bool _sourceColumnNullMapping;
 
        private bool _isNullable; 

        private object _coercedValue; 

        private PARAMETEROBJECTNAME(PARAMETEROBJECTNAME source) : this() { // V1.2.3300, Clone
            ADP.CheckArgumentNull(source, "source");
 
            source.CloneHelper(this);
 
            ICloneable cloneable = (_value as ICloneable); 
            if (null != cloneable) { // MDAC 49322
                _value = cloneable.Clone(); 
            }
        }

        private object CoercedValue { // V1.2.3300 
            get {
                return _coercedValue; 
            } 
            set {
                _coercedValue = value; 
            }
        }

        [ 
        RefreshProperties(RefreshProperties.All),
        RESNAMESPACE.ResCategoryAttribute(Res.DataCategory_Data), 
        RESNAMESPACE.ResDescriptionAttribute(Res.DbParameter_Direction), 
        ]
        override public ParameterDirection Direction { // V1.2.3300, XXXParameter V1.0.3300 
            get {
                ParameterDirection direction = _direction;
                return ((0 != direction) ? direction : ParameterDirection.Input);
            } 
            set {
                if (_direction != value) { 
                    switch (value) { // @perfnote: Enum.IsDefined 
                    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 { // V1.2.3300, XXXParameter V1.0.3300 
            get {
                return _isNullable; 
            } 
            set {
                _isNullable = value; 
            }
        }

#if USEOFFSET 
        [
        Browsable(false), 
        EditorBrowsableAttribute(EditorBrowsableState.Advanced), // MDAC 69508 
        RESNAMESPACE.ResCategoryAttribute(Res.DataCategory_Data),
        RESNAMESPACE.ResDescriptionAttribute(Res.DbParameter_Offset), 
        ]
        public int Offset {
            get {
                return _offset; 
            }
            set { 
                if (value < 0) { 
                    throw ADP.InvalidOffsetValue(value);
                } 
                _offset = value;
            }
        }
#else 
        internal int Offset {
            get { 
                return 0; 
            }
        } 
#endif

        [
        RESNAMESPACE.ResCategoryAttribute(Res.DataCategory_Data), 
        RESNAMESPACE.ResDescriptionAttribute(Res.DbParameter_Size),
        ] 
        override public int Size { // V1.2.3300, XXXParameter V1.0.3300 
            get {
                int size = _size; 
                if (0 == size) {
                    size = ValueSize(Value);
                }
                return size; 
            }
            set { 
                if (_size != value) { 
                    if (value < -1) {
                        throw ADP.InvalidSizeValue(value); 
                    }
                    PropertyChanging();
                    _size = value;
                } 
            }
        } 
 
        private void ResetSize() {
            if (0 != _size) { 
                PropertyChanging();
                _size = 0;
            }
        } 

        private bool ShouldSerializeSize() { // V1.2.3300 
            return (0 != _size); 
        }
 
        [
        RESNAMESPACE.ResCategoryAttribute(Res.DataCategory_Update),
        RESNAMESPACE.ResDescriptionAttribute(Res.DbParameter_SourceColumn),
        ] 
        override public string SourceColumn { // V1.2.3300, XXXParameter V1.0.3300
            get { 
                string sourceColumn = _sourceColumn; 
                return ((null != sourceColumn) ? sourceColumn : ADP.StrEmpty);
            } 
            set {
                _sourceColumn = value;
            }
        } 

        public override bool SourceColumnNullMapping { 
            get { 
                return _sourceColumnNullMapping;
            } 
            set {
                _sourceColumnNullMapping = value;
            }
        } 

        [ 
        RESNAMESPACE.ResCategoryAttribute(Res.DataCategory_Update), 
        RESNAMESPACE.ResDescriptionAttribute(Res.DbParameter_SourceVersion),
        ] 
        override public DataRowVersion SourceVersion { // V1.2.3300, XXXParameter V1.0.3300
            get {
                DataRowVersion sourceVersion = _sourceVersion;
                return ((0 != sourceVersion) ? sourceVersion : DataRowVersion.Current); 
            }
            set { 
                switch(value) { // @perfnote: Enum.IsDefined 
                case DataRowVersion.Original:
                case DataRowVersion.Current: 
                case DataRowVersion.Proposed:
                case DataRowVersion.Default:
                    _sourceVersion = value;
                    break; 
                default:
                    throw ADP.InvalidDataRowVersion(value); 
                } 
            }
        } 

        private void CloneHelperCore(PARAMETEROBJECTNAME destination) {
            destination._value                     = _value;
            // NOTE: _parent is not cloned 
            destination._direction                 = _direction;
            destination._size                      = _size; 
#if USEOFFSET 
            destination._offset                    = _offset;
#endif 
            destination._sourceColumn              = _sourceColumn;
            destination._sourceVersion             = _sourceVersion;
            destination._sourceColumnNullMapping   = _sourceColumnNullMapping;
            destination._isNullable                = _isNullable; 
        }
 
        internal void CopyTo(DbParameter destination) { 
            ADP.CheckArgumentNull(destination, "destination");
            CloneHelper((PARAMETEROBJECTNAME)destination); 
        }

        internal object CompareExchangeParent(object value, object comparand) {
            // the interlock guarantees same parameter won't belong to multiple collections 
            // at the same time, but to actually occur the user must really try
            // since we never declared thread safety, we don't care at this time 
            //return System.Threading.Interlocked.CompareExchange(ref _parent, value, comparand); 
            object parent = _parent;
            if (comparand == parent) { 
                _parent = value;
            }
            return parent;
        } 

        internal void ResetParent() { 
            _parent = null; 
        }
 
        override public string ToString() { // V1.2.3300, XXXParameter V1.0.3300
            return ParameterName;
        }
 
        private byte ValuePrecisionCore(object value) { // V1.2.3300
            if (value is Decimal) { 
                return ((System.Data.SqlTypes.SqlDecimal)(Decimal) value).Precision; // WebData 102913 
            }
            return 0; 
        }

        private  byte ValueScaleCore(object value) { // V1.2.3300
            if (value is Decimal) { 
                return (byte)((Decimal.GetBits((Decimal)value)[3] & 0x00ff0000) >> 0x10);
            } 
            return 0; 
        }
 
        private  int ValueSizeCore(object value) { // V1.2.3300
            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.
// Copyright (c) Microsoft Corporation. All rights reserved.
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DbParameterHelper.cs source code in C# .NET

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