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Is it possible to add some data, such as 123, to the "intList" variable below?
IQueryable<int> intList = Enumerable.Empty<int>().AsQueryable();
Many thanks in advance.
I would suggest one of the following options:
Either (if intList already exists):
intList = intList.AsEnumerable().Append(123).AsQueryable();
Or if it doesn't:
var intList = new List<int>(1){123}.AsQueryable();
Note generally AsQueryable is not commonly useful - but in contexts like unit tests (which seems to be your scenario here), code like above is acceptable.
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I'm accessing some values from the list to populate list of strings in this way
List<string> carNames = null;
foreach (var car in dal.Cars)
{
carNames.Add(car.Name);
}
Is there more efficient way, yet readable to write this? How would you do it?
"Is there a more efficient way"
More efficient is often micro optimization and most times decreases readability. However, one way to optimize performance would be to initialize the list with the correct capacity, which you know already because dal.Cars is also a list:
List<string> carNames = new List<string>(dal.Cars.Count);
carNames.AddRange(dal.Cars.Select(c => c.Name));
Sidenote: i really wonder why microsoft didn't add an overload for ToList/ToArray/ToHashSet which takes the capacity. Then you could use this (Does NOT compile):
List<string> carNames = dal.Cars.Select(c => c.Name).ToList(dal.Cars.Count);
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I'm new to C#.
I have a method that returns an object with the List of objects inside.
0 {{DapperRow, RecordedFormID = 'id1'}} object {Dapper.SqlMapper.DapperRow}
1 {{DapperRow, RecordedFormID = 'id2'}} object {Dapper.SqlMapper.DapperRow}
How can I get those ids as strings?
Here is a screenshot
You can use System.Linq namespace and do this:
yourObject.Select(x => x.RecordedFormID);
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So I created an array with 100 variables using Enumerable.Range. The data type is limited to Int32.
Problem
How can I create the same array with SByte?
Am I right in thinking I would need to use a loop to create and index the variables?
I have looked around online and most results touch on declaring counting variables for the loop but not using a loop to declare variables
Just cast them:
SByte[] array = Enumerable.Range(0, 100).Select(i => (SByte) i).ToArray();
note that SByte is not cls compliant, you might want to use short instead.
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What is better method to use for object preparation logic:
a) with return value
List<Users> users = LoadUsers();
users = PrepareUsers(users);
b) or with void type
List<Users> users = LoadUsers();
PrepareUsers(users)
Are you setting properties on existing User objects or are you creating new ones?
If you're simply changing existing objects, then there's no reason why you'd want to return them, it's redundant. Worse, it's misleading - the client will think his objects were left untouched and that you're creating new objects when in fact you're not.
If you're creating new ones, well then, you obviously need to return them.
Alternative b. since you are working with the same user objects, there is no reason to reassign the variable.
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I have a URL, such as http://www.mydomain.com/?param1=asd2¶m2=asd2.
I'd like to create a sort of Frequest object, so than I can easily do somethings like:
Request.Querystring("param1")
without do a further Split and access to the array. Can I?
Your question is not clear. Are you looking something like this?
var uri = new Uri("http://www.mydomain.com/?param1=asd2¶m2=asd2");
var nv = uri.ParseQueryString();
Console.WriteLine(nv["param1"]);
EDIT
It seams one of my referenced libraries implemented this extension Method. Anyway, it can be done as
var uri = new Uri("http://www.mydomain.com/?param1=asd2¶m2=asd2");
var nv = HttpUtility.ParseQueryString(uri.Query);
Console.WriteLine(nv["param1"]);