Dealing with large selection ranges in Excel interop [duplicate]

问题

Possible Duplicate:
OutofMemory Exception Object Array Size

I am trying to capture a spreadsheet data in to a 2D array. I am using VSTO.

int rc = 1048576;
int cc = 1638;

string[,] arr = new string[rc, cc];

The last line throws Out of Memory exception. I would like to show message telling the user only 'X' elements can be captured.

Checked MSDN and there is a row count limit mentioned of 16,777,216 for the data-table.So a data table can hold data of size of a worksheet. Cant find limit either for 2D array.

My issue is not with WHY the exception. What I am looking for is if you are doing VSTO development, and had to capture a worksheet in a DataTable to perform In-Memory joins etc, you will need to do this:

string[,] arr = new string[rc, cc]; 
Microsoft.Office.Interop.Excel.Range selection 
arr = selection.Value as string[,];

and then copy the data from that array to data table. Now what will be the ideal limit for number of elements a user should select. So I can set that rowcount/columncount lmits and display message when selection exceeds this criteria. OR is there any other way to create a data table based on selected range in a worksheet, considering first row is always Column headers.

回答1:

What you can do is create your own class:

    public class MyClass {   
 public static string col1 {get;set;}   
 public static string col2 {get;set;}  
  public static string col3 {get;set;}   
 //etc for every column

}

read the first row into the properties of MyClass

then read every row of your worksheet into a list like this:

List<string> myList = new IList<string>();

myList.append(anInstanceofMyClass);

repeat for every row of data

来源：https://stackoverflow.com/questions/12843173/dealing-with-large-selection-ranges-in-excel-interop

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excel

vsto