Constraint.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Data / System / Data / Constraint.cs / 1305376 / 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))
    ]
    public 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. 
        /// 
        [CLSCompliant(false)] 
        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.
// 
// [....] 
// [....]
// [....] 
//----------------------------------------------------------------------------- 

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))
    ]
    public 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. 
        /// 
        [CLSCompliant(false)] 
        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.
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Constraint.cs source code in C# .NET

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