DefaultValue

object System.Data.DataColumn.DefaultValue

getset

Definition at line 528 of file DataColumn.cs.

    {
        get
        {
            if (_defaultValue == DBNull.Value && _implementsINullable)
            {
                if (_storage != null)
                {
                    _defaultValue = _storage._nullValue;
                }
                else if (_isSqlType)
                {
                    _defaultValue = SqlConvert.ChangeTypeForDefaultValue(_defaultValue, _dataType, FormatProvider);
                }
                else if (_implementsINullable)
                {
                    PropertyInfo property = _dataType.GetProperty("Null", BindingFlags.Static | BindingFlags.Public);
                    if (property != null)
                    {
                        _defaultValue = property.GetValue(null, null);
                    }
                }
            }
            return _defaultValue;
        }
        [param: AllowNull]
        set
        {
            DataCommonEventSource.Log.Trace("<ds.DataColumn.set_DefaultValue|API> {0}", ObjectID);
            if (_defaultValue != null && DefaultValue.Equals(value))
            {
                return;
            }
            if (AutoIncrement)
            {
                throw ExceptionBuilder.DefaultValueAndAutoIncrement();
            }
            object obj = ((value == null) ? DBNull.Value : value);
            if (obj != DBNull.Value && DataType != typeof(object))
            {
                try
                {
                    obj = SqlConvert.ChangeTypeForDefaultValue(obj, DataType, FormatProvider);
                }
                catch (InvalidCastException inner)
                {
                    throw ExceptionBuilder.DefaultValueColumnDataType(ColumnName, obj.GetType(), DataType, inner);
                }
            }
            _defaultValue = obj;
            _defaultValueIsNull = ((obj == DBNull.Value || (ImplementsINullable && DataStorage.IsObjectSqlNull(obj))) ? true : false);
        }
    }

Referenced by System.Data.ForeignKeyConstraint.CascadeDelete(), System.Data.ForeignKeyConstraint.CascadeUpdate(), System.Data.DataTableReader.GetSchemaTableFromDataTable(), and System.Data.DataColumn.InitializeRecord().