protected virtual SqlQuery WhereQuery <T>(Expression <Func <T, bool> > expression) where T : class
{
var queryProperties = new QueryParameterCollection();
// walk the tree and build up a list of query parameter objects
// from the left and right branches of the expression tree
ExpressionParserResolver.Resolve(expression.Body).Parser(expression.Body, ExpressionType.Default, ref queryProperties);
return(queryProperties.ToQuery());
}
public void Parser(Expression expression, ExpressionType linkingType, ref QueryParameterCollection queryProperties)
{
var methodCallExpression = (MethodCallExpression)expression;
var propertyName = GetPropertyName(methodCallExpression);
string propertyValue = MethodCallToSqlArgument(methodCallExpression);
var opr = MethodCallToSqlOperand(methodCallExpression);
var link = GetLinkOperator(linkingType);
if (!string.IsNullOrEmpty(propertyName) &&
!string.IsNullOrEmpty(propertyValue) &&
!string.IsNullOrEmpty(opr))
{
queryProperties.Add(new QueryParameter(link, propertyName, propertyValue, opr));
}
}
public void Parser(Expression expression, ExpressionType linkingType, ref QueryParameterCollection queryProperties)
{
var binary = (BinaryExpression)expression;
if (expression.NodeType != ExpressionType.AndAlso && expression.NodeType != ExpressionType.OrElse)
{
var propertyName = GetPropertyName(binary);
dynamic propertyValue = GetPropetyValue(binary.Right as MemberExpression);
var opr = GetOperator(expression.NodeType);
var link = GetLinkOperator(linkingType);
queryProperties.Add(new QueryParameter(link, propertyName, propertyValue, opr));
}
else
{
Resolver.Resolve(binary.Left).Parser(binary.Left, expression.NodeType, ref queryProperties);
Resolver.Resolve(binary.Right).Parser(binary.Right, expression.NodeType, ref queryProperties);
}
}
