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C# Generic Method Parameter

Posted on 2010-09-20
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Last Modified: 2012-05-10
Hello,

Is there a way to make the method below generic?  

CustomerData is a strongly-typed dataset.  I would like to be able to somehow pass a generic strongly-typed dataset in as a parameter or however this can be done so that we only use one method for all instances.  Otherwise we will need to duplicate this method about 10 times with different dataset types.

We would also pass in the table name as string for the dataset.

Thanks.
public string[] GetCustomerSuggestionList(string columnName, string prefix, int count)
        {
 		CustomerData customerData = new CustomerData();
                customerData = GetCustomersAll();

              	EnumerableRowCollection<DataRow> query = from customer in customerData.Tables["customer"].AsEnumerable()
                        where customer.Field<string>(columnName) != null && customer.Field<string>(columnName).ToLower().StartsWith(prefix.ToLower())
                        select customer;
                     
 		UtilityBF utilityBF = new UtilityBF();
                return utilityBF.GetDistinctQueryItems(query, columnName, count);
        }

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Question by:kruegerste
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4 Comments
 
LVL 75

Accepted Solution

by:
käµfm³d   👽 earned 500 total points
ID: 33718590
Something like this?
public string[] GetCustomerSuggestionList<T>(T dataSet, string tableName, string columnName, string prefix, int count)
    where T : DataSet
{
    EnumerableRowCollection<DataRow> query = from customer in dataSet.Tables[tableName].AsEnumerable()
                                             where customer.Field<string>(columnName) != null && customer.Field<string>(columnName).ToLower().StartsWith(prefix.ToLower())
                                             select customer;

    UtilityBF utilityBF = new UtilityBF();
    return utilityBF.GetDistinctQueryItems(query, columnName, count);
}

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Expert Comment

by:käµfm³d 👽
ID: 33718630
Inferred usage:
public void SomeSub()
{
    CustomerData customerData = GetCustomersAll();

    string[] result = GetCustomerSuggestionList<CustomerData>(customerData, "customer", "address", "something", 4);
}

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Author Closing Comment

by:kruegerste
ID: 33719271
Thanks.  I was missing the where statement.
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LVL 75

Expert Comment

by:käµfm³d 👽
ID: 33719356
NP. Glad to help  :)
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