private static CriteriaOperator ProcessSimpleNullExpression(OperandProperty property, ExpressionType expressionType)
{
if (expressionType == ExpressionType.Equal)
return property.IsNull();
if (expressionType == ExpressionType.NotEqual)
return property.IsNotNull();
throw new Exception("Cannot supply null value to operator " + expressionType);
}
protected CriteriaOperator GetFilterCriterion(ComboBoxEdit pi, BaseEdit e, bool IsField, string FieldName)
{
if (this.IsFilterExist(pi, e))
{
OperandProperty opLeft = new OperandProperty(this.column.FieldName);
int num = this.OperationNumber(pi.SelectedItem);
if (num < 0)
{
return null;
}
switch (((ExpressionOperators) this.operators[0, num]))
{
case ExpressionOperators.Equals:
return (CriteriaOperator) (opLeft == this.GetRightOperand(e, IsField, FieldName));
case ExpressionOperators.NotEquals:
return (CriteriaOperator) (opLeft != this.GetRightOperand(e, IsField, FieldName));
case ExpressionOperators.Greater:
return (CriteriaOperator) (opLeft > this.GetRightOperand(e, IsField, FieldName));
case ExpressionOperators.GreaterOrEqual:
return (CriteriaOperator) (opLeft >= this.GetRightOperand(e, IsField, FieldName));
case ExpressionOperators.Less:
return (CriteriaOperator) (opLeft < this.GetRightOperand(e, IsField, FieldName));
case ExpressionOperators.LessOrEqual:
return (CriteriaOperator) (opLeft <= this.GetRightOperand(e, IsField, FieldName));
case ExpressionOperators.Blanks:
return opLeft.IsNull();
case ExpressionOperators.NonBlanks:
return opLeft.IsNotNull();
case ExpressionOperators.Like:
return new BinaryOperator(opLeft, this.PatchLikeOperand(this.GetRightOperand(e, IsField, FieldName)), BinaryOperatorType.Like);
//暂时未处理
//case ExpressionOperators.NotLike:
// return CriteriaOperator.op_LogicalNot(new BinaryOperator(opLeft, this.PatchLikeOperand(this.GetRightOperand(e, IsField, FieldName)), BinaryOperatorType.Like));
}
}
return null;
}