PrimaryKey

DataColumn [] System.Data.DataTable.PrimaryKey

getsetinherited

Definition at line 606 of file DataTable.cs.

    {
        get
        {
            UniqueConstraint primaryKey = _primaryKey;
            if (primaryKey != null)
            {
                return primaryKey.Key.ToArray();
            }
            return Array.Empty<DataColumn>();
        }
        [param: AllowNull]
        set
        {
            UniqueConstraint uniqueConstraint = null;
            UniqueConstraint uniqueConstraint2 = null;
            if (fInitInProgress && value != null)
            {
                _delayedSetPrimaryKey = value;
                return;
            }
            if (value != null && value.Length != 0)
            {
                int num = 0;
                for (int i = 0; i < value.Length && value[i] != null; i++)
                {
                    num++;
                }
                if (num != 0)
                {
                    DataColumn[] array = value;
                    if (num != value.Length)
                    {
                        array = new DataColumn[num];
                        for (int j = 0; j < num; j++)
                        {
                            array[j] = value[j];
                        }
                    }
                    uniqueConstraint = new UniqueConstraint(array);
                    if (uniqueConstraint.Table != this)
                    {
                        throw ExceptionBuilder.TableForeignPrimaryKey();
                    }
                }
            }
            if (uniqueConstraint == _primaryKey || (uniqueConstraint != null && uniqueConstraint.Equals(_primaryKey)))
            {
                return;
            }
            if ((uniqueConstraint2 = (UniqueConstraint)Constraints.FindConstraint(uniqueConstraint)) != null)
            {
                uniqueConstraint.ColumnsReference.CopyTo(uniqueConstraint2.Key.ColumnsReference, 0);
                uniqueConstraint = uniqueConstraint2;
            }
            UniqueConstraint primaryKey = _primaryKey;
            _primaryKey = null;
            if (primaryKey != null)
            {
                primaryKey.ConstraintIndex.RemoveRef();
                if (_loadIndex != null)
                {
                    _loadIndex.RemoveRef();
                    _loadIndex = null;
                }
                if (_loadIndexwithOriginalAdded != null)
                {
                    _loadIndexwithOriginalAdded.RemoveRef();
                    _loadIndexwithOriginalAdded = null;
                }
                if (_loadIndexwithCurrentDeleted != null)
                {
                    _loadIndexwithCurrentDeleted.RemoveRef();
                    _loadIndexwithCurrentDeleted = null;
                }
                Constraints.Remove(primaryKey);
            }
            if (uniqueConstraint != null && uniqueConstraint2 == null)
            {
                Constraints.Add(uniqueConstraint);
            }
            _primaryKey = uniqueConstraint;
            _primaryIndex = ((uniqueConstraint != null) ? uniqueConstraint.Key.GetIndexDesc() : Array.Empty<IndexField>());
            if (_primaryKey != null)
            {
                uniqueConstraint.ConstraintIndex.AddRef();
                for (int k = 0; k < uniqueConstraint.ColumnsReference.Length; k++)
                {
                    uniqueConstraint.ColumnsReference[k].AllowDBNull = false;
                }
            }
        }
    }

Referenced by System.Data.DataTable.AddUniqueKey(), System.Data.DataTable.CloneTo(), System.Data.DataTable.EndInit(), System.Data.DataTable.Load(), and System.Data.Merger.MergeSchema().