473,394 Members | 1,759 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 473,394 software developers and data experts.

Casting to a generic type

I have this method in an inherited DataGridView, but it won't compile
because the newly added special case is not allowed to cast 'string' to 'T'.

I know this cast will be valid whenever that code is reached. Is there a way
to do it, or must I make a separate non-generic method for the string case?

Eq.
public T[] GetSelectedColumnValues<T>(int col)
{
T[] values = new T[SelectedRows.Count];

for (int i = 0; i < values.Length; i++)
{
if (values is string[]) // this way we can safely deal with DBNull as an
empty string
{
values[i] = (T) SelectedRows[i].Cells[col].Value.ToString();
}
else // general case
{
values[i] = (T) SelectedRows[i].Cells[col].Value;
}
}

return values;
}
Aug 22 '08 #1
1 1080
values[i] = (T) SelectedRows[i].Cells[col].Value.ToString();

Oh, I posted too soon. I now see that it works with a double cast: (T)
(object)

Nasty hack to start with, but there you go.

Eq.
Aug 22 '08 #2

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

231
by: Brian Blais | last post by:
Hello, I saw on a couple of recent posts people saying that casting the return value of malloc is bad, like: d=(double *) malloc(50*sizeof(double)); why is this bad? I had always thought...
35
by: ytrama | last post by:
Hi, I have read in one of old posting that don't cast of pointer which is returned by the malloc. I would like to know the reason. Thanks in advance, YTR
7
by: yufufi | last post by:
lets say we have a 'shape' class which doesn't implement IComparable interface.. compiler doesn't give you error for the lines below.. shape b= new shape(); IComparable h; h=(IComparable)b;...
1
by: Mark McDonald | last post by:
This question kind of follows on from Mike Spass’ posting 10/11/2004; I don’t understand why you can’t declare an implicit operator to convert a base class to a derived class. The text...
4
by: KC | last post by:
Could some one explain to me the casting rules for sending generic lists, ex. List<Person>, to a function that accepts List<object>? I cannot get the following easy-cheesy app to work. I get the...
8
by: Kris Jennings | last post by:
Hi, I am trying to create a new generic class and am having trouble casting a generic type to a specific type. For example, public class MyClass<Twhere T : MyItemClass, new() { public...
3
by: Tigger | last post by:
I have an object which could be compared to a DataTable/List which I am trying to genericify. I've spent about a day so far in refactoring and in the process gone through some hoops and hit some...
7
by: S. Lortan | last post by:
Hi guys, Sorry for this stupid question, but I don't know why it isn't working. Here is my (example) code: namespace Test { class A { public string Label1; }
3
by: =?Utf-8?B?TWlydHVs?= | last post by:
Hi I'm currently working with vbscripting through MSScriptControl. We have shared some of our objects that should be available for scripting. Some of the functions of these objects will return...
15
by: Anthony Paul | last post by:
Let's say that I would like a generic type that supports Min/Max properties and can be double or integer or even datetime if need be, something flexible. So I go about creating the following...
0
by: Charles Arthur | last post by:
How do i turn on java script on a villaon, callus and itel keypad mobile phone
0
by: ryjfgjl | last post by:
If we have dozens or hundreds of excel to import into the database, if we use the excel import function provided by database editors such as navicat, it will be extremely tedious and time-consuming...
0
by: ryjfgjl | last post by:
In our work, we often receive Excel tables with data in the same format. If we want to analyze these data, it can be difficult to analyze them because the data is spread across multiple Excel files...
0
by: emmanuelkatto | last post by:
Hi All, I am Emmanuel katto from Uganda. I want to ask what challenges you've faced while migrating a website to cloud. Please let me know. Thanks! Emmanuel
0
BarryA
by: BarryA | last post by:
What are the essential steps and strategies outlined in the Data Structures and Algorithms (DSA) roadmap for aspiring data scientists? How can individuals effectively utilize this roadmap to progress...
1
by: nemocccc | last post by:
hello, everyone, I want to develop a software for my android phone for daily needs, any suggestions?
0
marktang
by: marktang | last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However,...
0
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can...
0
tracyyun
by: tracyyun | last post by:
Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.