Constraint.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 / Constraint.cs / 1 / Constraint.cs
                        

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

namespace System.Data { 
    using System;
    using System.ComponentModel;
    using System.Globalization;
 
    /// 
    ///    Represents a constraint that can be enforced on one or 
    ///       more  objects. 
    /// 
    [ 
    DefaultProperty("ConstraintName"),
    TypeConverter(typeof(ConstraintConverter))
    ]
#if WINFSInternalOnly 
    internal
#else 
    public 
#endif
    abstract class Constraint { 
        internal String name = "";
        private String _schemaName = "";
        private bool inCollection = false;
        private DataSet dataSet = null; 

        internal PropertyCollection extendedProperties = null; 
 
        /// 
        /// The name of this constraint within the  
        /// .
        /// 
        [
        DefaultValue(""), 
        ResDescriptionAttribute(Res.ConstraintNameDescr),
        ResCategoryAttribute(Res.DataCategory_Data) 
        ] 
        public virtual string ConstraintName {
            get { 
                return name;
            }
            set {
                if (value == null) 
                    value = "";
 
                if (Common.ADP.IsEmpty(value) && (Table != null) && InCollection) 
                    throw ExceptionBuilder.NoConstraintName();
 
                CultureInfo locale = (Table != null ? Table.Locale : CultureInfo.CurrentCulture);
                if (String.Compare(name, value, true, locale) != 0) {
                    if ((Table != null) && InCollection) {
                        Table.Constraints.RegisterName(value); 
                        if (name.Length != 0)
                            Table.Constraints.UnregisterName(name); 
                    } 
                    name = value;
                } 
                else if (String.Compare(name, value, false, locale) != 0) {
                    name = value;
                }
            } 
        }
 
        internal String SchemaName { 
            get {
                if (Common.ADP.IsEmpty(_schemaName)) 
                    return ConstraintName;
                else
                    return _schemaName;
            } 

            set { 
                if (!Common.ADP.IsEmpty(value)) 
                    _schemaName = value;
            } 
        }


        internal virtual bool InCollection { 
            get {		// ACCESSOR: virtual was missing from this get
                return inCollection; 
            } 
            set {
                inCollection = value; 
                if (value)
                    dataSet = Table.DataSet;
                else
                    dataSet = null; 
            }
        } 
 
        /// 
        /// Gets the  to which the constraint applies. 
        /// 
        [ResDescriptionAttribute(Res.ConstraintTableDescr)]
        public abstract DataTable Table {
            get; 
        }
 
        ///  
        ///    Gets the collection of customized user information.
        ///  
        [
        ResCategoryAttribute(Res.DataCategory_Data),
        Browsable(false),
        ResDescriptionAttribute(Res.ExtendedPropertiesDescr) 
        ]
        public PropertyCollection ExtendedProperties { 
            get { 
                if (extendedProperties == null) {
                    extendedProperties = new PropertyCollection(); 
                }
                return extendedProperties;
            }
        } 

        internal abstract bool ContainsColumn(DataColumn column); 
 
        internal abstract bool CanEnableConstraint();
 
        internal abstract Constraint Clone(DataSet destination);
        internal abstract Constraint Clone(DataSet destination, bool ignoreNSforTableLookup);

        internal void CheckConstraint() { 
            if (!CanEnableConstraint()) {
                throw ExceptionBuilder.ConstraintViolation(ConstraintName); 
            } 
        }
 
        internal abstract void CheckCanAddToCollection(ConstraintCollection constraint);
        internal abstract bool CanBeRemovedFromCollection(ConstraintCollection constraint, bool fThrowException);

        internal abstract void CheckConstraint(DataRow row, DataRowAction action); 
        internal abstract void CheckState();
 
         protected void CheckStateForProperty() { 
            try {
                CheckState(); 
            }
            catch (Exception e) {
                //
                if (!Common.ADP.IsCatchableExceptionType (e)) { 
                   throw;
                } 
                throw ExceptionBuilder.BadObjectPropertyAccess(e.Message); 
            }
        } 

        /// 
        /// Gets the  to which this constraint belongs.
        ///  
#if WINFSInternalOnly
#else 
        [CLSCompliant(false)] 
#endif
        protected virtual DataSet _DataSet { 
            get {
                return dataSet;
            }
        } 

        ///  
        /// Sets the constraint's . 
        /// 
        protected internal void SetDataSet(DataSet dataSet) { 
            this.dataSet = dataSet;
        }
        internal abstract bool IsConstraintViolated();
 
         public override string ToString() {
            return ConstraintName; 
        } 
    }
} 

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

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