DataColumnMapping.cs source code in C# .NET

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Code:

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

                        
                            //------------------------------------------------------------------------------ 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
// [....]
//----------------------------------------------------------------------------- 
 
namespace System.Data.Common {
 
    using System;
    using System.ComponentModel;
    using System.ComponentModel.Design.Serialization;
    using System.Data; 
    using System.Diagnostics;
    using System.Globalization; 
    using System.Reflection; 

    [ 
    System.ComponentModel.TypeConverterAttribute(typeof(System.Data.Common.DataColumnMapping.DataColumnMappingConverter))
    ]
#if WINFSInternalOnly
    internal 
#else
    public 
#endif 
    sealed class DataColumnMapping : MarshalByRefObject, IColumnMapping, ICloneable {
        private DataColumnMappingCollection parent; 
        private string _dataSetColumnName;
        private string _sourceColumnName;

        public DataColumnMapping() { 
        }
 
        public DataColumnMapping(string sourceColumn, string dataSetColumn) { 
            SourceColumn = sourceColumn;
            DataSetColumn = dataSetColumn; 
        }

        [
        DefaultValue(""), 
        ResCategoryAttribute(Res.DataCategory_Mapping),
        ResDescriptionAttribute(Res.DataColumnMapping_DataSetColumn), 
        ] 
        public string DataSetColumn {
            get { 
                string dataSetColumnName = _dataSetColumnName;
                return ((null != dataSetColumnName) ? dataSetColumnName : ADP.StrEmpty);
            }
            set { 
                _dataSetColumnName = value;
            } 
        } 

        internal DataColumnMappingCollection Parent { 
            get {
                return parent;
            }
            set { 
                parent = value;
            } 
        } 

        [ 
        DefaultValue(""),
        ResCategoryAttribute(Res.DataCategory_Mapping),
        ResDescriptionAttribute(Res.DataColumnMapping_SourceColumn),
        ] 
        public string SourceColumn {
            get { 
                string sourceColumnName = _sourceColumnName; 
                return ((null != sourceColumnName) ? sourceColumnName : ADP.StrEmpty);
            } 
            set {
                if ((null != Parent) && (0 != ADP.SrcCompare(_sourceColumnName, value))) {
                    Parent.ValidateSourceColumn(-1, value);
                } 
                _sourceColumnName = value;
            } 
        } 

        object ICloneable.Clone() { 
            DataColumnMapping clone = new DataColumnMapping(); // MDAC 81448
            clone._sourceColumnName = _sourceColumnName;
            clone._dataSetColumnName = _dataSetColumnName;
            return clone; 
        }
 
        [ EditorBrowsableAttribute(EditorBrowsableState.Advanced) ] // MDAC 69508 
        public DataColumn GetDataColumnBySchemaAction(DataTable dataTable, Type dataType, MissingSchemaAction schemaAction) {
            return GetDataColumnBySchemaAction(SourceColumn, DataSetColumn, dataTable, dataType, schemaAction); 
        }

        [ EditorBrowsableAttribute(EditorBrowsableState.Advanced) ] // MDAC 69508
        static public DataColumn GetDataColumnBySchemaAction(string sourceColumn, string dataSetColumn, DataTable dataTable, Type dataType, MissingSchemaAction schemaAction) { 
            if (null == dataTable) {
                throw ADP.ArgumentNull("dataTable"); 
            } 
            if (ADP.IsEmpty(dataSetColumn)) {
#if DEBUG 
                if (AdapterSwitches.DataSchema.TraceWarning) {
                    Debug.WriteLine("explicit filtering of SourceColumn \"" + sourceColumn + "\"");
                }
#endif 
                return null;
            } 
            DataColumnCollection columns = dataTable.Columns; 
            Debug.Assert(null != columns, "GetDataColumnBySchemaAction: unexpected null DataColumnCollection");
 
            int index = columns.IndexOf(dataSetColumn);
            if ((0 <= index) && (index < columns.Count)) {
                DataColumn dataColumn = columns[index];
                Debug.Assert(null != dataColumn, "GetDataColumnBySchemaAction: unexpected null dataColumn"); 

                if (!ADP.IsEmpty(dataColumn.Expression)) { 
#if DEBUG 
                    if (AdapterSwitches.DataSchema.TraceError) {
                        Debug.WriteLine("schema mismatch on DataColumn \"" + dataSetColumn + "\" which is a computed column"); 
                    }
#endif
                    throw ADP.ColumnSchemaExpression(sourceColumn, dataSetColumn);
                } 
                if ((null == dataType) || (dataType.IsArray == dataColumn.DataType.IsArray)) {
#if DEBUG 
                    if (AdapterSwitches.DataSchema.TraceInfo) { 
                        Debug.WriteLine("schema match on DataColumn \"" + dataSetColumn + "\"");
                    } 
#endif
                    return dataColumn;
                }
#if DEBUG 
                if (AdapterSwitches.DataSchema.TraceWarning) {
                    Debug.WriteLine("schema mismatch on DataColumn \"" + dataSetColumn + "\" " + dataType.Name + " != " + dataColumn.DataType.Name); 
                } 
#endif
                throw ADP.ColumnSchemaMismatch(sourceColumn, dataType, dataColumn); 
            }
            switch (schemaAction) {
                case MissingSchemaAction.Add:
                case MissingSchemaAction.AddWithKey: 
#if DEBUG
                    if (AdapterSwitches.DataSchema.TraceInfo) { 
                        Debug.WriteLine("schema add of DataColumn \"" + dataSetColumn + "\" <" + Convert.ToString(dataType, CultureInfo.InvariantCulture) +">"); 
                    }
#endif 
                    return new DataColumn(dataSetColumn, dataType);

                case MissingSchemaAction.Ignore:
#if DEBUG 
                    if (AdapterSwitches.DataSchema.TraceWarning) {
                        Debug.WriteLine("schema filter of DataColumn \"" + dataSetColumn + "\" <" + Convert.ToString(dataType, CultureInfo.InvariantCulture) +">"); 
                    } 
#endif
                    return null; 

                case MissingSchemaAction.Error:
#if DEBUG
                    if (AdapterSwitches.DataSchema.TraceError) { 
                        Debug.WriteLine("schema error on DataColumn \"" + dataSetColumn + "\" <" + Convert.ToString(dataType, CultureInfo.InvariantCulture) +">");
                    } 
#endif 
                    throw ADP.ColumnSchemaMissing(dataSetColumn, dataTable.TableName, sourceColumn);
            } 
            throw ADP.InvalidMissingSchemaAction(schemaAction);
        }

        public override String ToString() { 
            return SourceColumn;
        } 
 
        sealed internal class DataColumnMappingConverter : System.ComponentModel.ExpandableObjectConverter {
 
            // converter classes should have public ctor
            public DataColumnMappingConverter() {
            }
 
            override public bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) {
                if (typeof(InstanceDescriptor) == destinationType) { 
                    return true; 
                }
                return base.CanConvertTo(context, destinationType); 
            }

            override public object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) {
                if (null == destinationType) { 
                    throw ADP.ArgumentNull("destinationType");
                } 
 
                if ((typeof(InstanceDescriptor) == destinationType) && (value is DataColumnMapping)) {
                    DataColumnMapping mapping = (DataColumnMapping)value; 

                    object[] values = new object[] { mapping.SourceColumn, mapping.DataSetColumn };
                    Type[] types = new Type[] { typeof(string), typeof(string) };
 
                    ConstructorInfo ctor = typeof(DataColumnMapping).GetConstructor(types);
                    return new InstanceDescriptor(ctor, values); 
                } 
                return base.ConvertTo(context, culture, value, destinationType);
            } 
        }
    }
}

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

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