public void Datetime()
{
Expression <Func <DateTime> > expr = () => DateTime.Parse("2012-5-25");
var value = ExpressionCalculater.Eval(expr);
Assert.AreEqual(new DateTime(2012, 5, 25), value);
}
public void String()
{
Expression <Func <string> > expr = () => "hello world!";
var value = ExpressionCalculater.Eval(expr);
Assert.AreEqual("hello world!", value);
}
public void Boolean()
{
Expression <Func <bool> > expr = () => true;
var value = ExpressionCalculater.Eval(expr);
Assert.AreEqual(true, value);
expr = () => false;
value = ExpressionCalculater.Eval(expr);
Assert.AreEqual(false, value);
}
public void StringContactParseTest()
{
var esql = "'AAA' + 'BBB'";
var expr = CreateExpression(esql);
var value = ExpressionCalculater.Eval(expr);
Assert.AreEqual("AAABBB", value);
esql = "'AAA' + 'BBB' + 'CCC'";
expr = CreateExpression(esql);
value = ExpressionCalculater.Eval(expr);
Assert.AreEqual("AAABBBCCC", value);
}
public void New()
{
Expression <Func <Employee, object> > expr = e => new { e.FirstName, e.LastName };
Console.WriteLine(expr);
var employee = new Employee {
FirstName = "Mike", LastName = "Mak"
};
var value = ExpressionCalculater.Eval(expr, new ObjectParameter("e", employee)) as dynamic;
Assert.IsNotNull(value);
Assert.AreEqual(employee.FirstName, value.FirstName);
Assert.AreEqual(employee.LastName, value.LastName);
}
public void Interger()
{
Expression <Func <int> > expr = () => 5;
Console.WriteLine(expr);
var value = ExpressionCalculater.Eval(expr);
Assert.AreEqual(5, value);
expr = () => - 5;
Console.WriteLine(expr);
value = ExpressionCalculater.Eval(expr);
Assert.AreEqual(-5, value);
}
public void MemberAccess()
{
var esql = "@e.FirstName";
var employee = new Employee {
FirstName = "Mike"
};
var p = new ObjectParameter("e", employee);
var expressionParser = new QueryParser(esql, new[] { p });
var expr = expressionParser.ParseExpression();
Console.WriteLine(expr);
var value = ExpressionCalculater.Eval(expr, new ObjectParameter("e", employee));
Assert.AreEqual("Mike", value);
}
public void Row1()
{
var employee = new Employee {
FirstName = "Mike", LastName = "Mak"
};
var esql = "row(FirstName, LastName)";
//var expressionParser = new QueryParser(employee, esql);
var parser = new QueryParser(employee, esql);
var expr = parser.ParseExpression();
Console.WriteLine(expr);
var a = ExpressionCalculater.Eval(expr, new ObjectParameter("", employee));
var value = a as IDataRecord;
Assert.IsNotNull(value);
Assert.AreEqual(employee.FirstName, value["FirstName"]);
Assert.AreEqual(employee.LastName, value["LastName"]);
}
public void Row2()
{
var employee = new Employee {
FirstName = "Mike", LastName = "Mak"
};
var esql = "row(@e.FirstName as F, @e.LastName as L)";
//var expressionParser = new QueryParser(employee, esql);
var parser = new QueryParser(esql, new ObjectParameter("e", employee));
var expr = parser.ParseExpression();
Console.WriteLine(expr);
var record = ExpressionCalculater.Eval(expr, new ObjectParameter("", employee)) as IDataRecord;
Assert.IsNotNull(record);
Assert.AreEqual(employee.FirstName, record["F"]);
Assert.AreEqual(employee.LastName, record["L"]);
var value = record as dynamic;
Assert.AreEqual(employee.FirstName, value.F);
Assert.AreEqual(employee.LastName, value.L);
}
