问题
Please excuse the very entry-level nature of this question. I'm very new to c#.
When I work with various libraries and components that have objects stored in collections, I'm able to retrieve the object by either the object name or its index. I want to implement a similar collection in c#; however, my understanding is that
- A dictionary returns a key value pair (the key and the object) and I only want it to return the object, not the key.
- A list won't allow a lookup key.
I'm sure this is very basic but if someone could point me in the right direction then I would certainly appreciate it. See code example below:
class CallingProgram
{
private void useColumn()
{
DataTable tbl = new DataTable();
//I need a collection that can do this
DataColumn col = new DataColumn();
col = tbl.Columns["Column_1"];
//and this
col = tbl.Columns[0];
//What I want to do and I've seen collections that work like this
foreach(DataColumn colmn in tbl.Columns)
{
//foreach doesn't work because it returns a key/value pair
}
//What works, but I don't always want to the end user of the library
//to always have to type '.Values'
foreach (DataColumn colmn in tbl.Columns.Values)
{
//do something
}
}
}
public class DataTable
{
public string TableName { get; set; }
public Dictionary<string, DataColumn> Columns { get; set; }
public DataTable()
{
Dictionary<string, DataColumn> Columns = new Dictionary<string, DataColumn>();
DataColumn col = new DataColumn();
col.ColumnName = "Column_1";
Columns.Add(col.ColumnName, col);
}
}
public class DataColumn
{
public string ColumnName { get; set; }
public string ColumnProperty { get; set; }
}
来源：https://stackoverflow.com/questions/60347180/what-should-i-use-a-dictionary-list-or-something-else