How to best fetch a cell value from excel using VSTO?

问题

I am trying to get cells from excel into csharp but not sure what's the best variable type to read it into.

If I make the variable a string and the cell value is a double I get a parse error. If I make the variable double then when the cell is a string it wont work.

Here's the code I am running:

 try
 {
        string i = Globals.Sheet1.Cells[7, 7].Value;
        double num;
        if (i == null) return;

        if (double.TryParse(i, out num)) 
        {
              .
              .
              .
        }
}
catch (Exception e)
{
       MessageBox.Show(e.ToString());
}

回答1:

Make it an object, then find out the right type after you have gotten the value out of the cell.

I don't know about VSTO, but in the Excel Interop assembly, there were a Value2 and a Text property which both returned object, and could be casted through polymorphism to the correct type. Doesn't VSTO provide those?

回答2:

You could just call ToString() on the object and then do double.TryParse() to see if the value is numeric or text

回答3:

Simply

double x = (double)Globals.Sheet1.Cells[7, 7].Value;

will get you the double value or throw an exception (no need to catch it, it will be displayed properly in a dialog box in Excel if nothing catches it upstream).

回答4:

I prefer to get the text value directly and do not want to deal with the underlying datatype for the most part. I get the text value as TravisWhidden comment mentioned, here is my VSTO C# code to achieve a read from a cell and return a text value regardless of the base object.

This my extension method which works off of the Worksheet page:

public static string CellGetStringValue(this WorksheetBase theSheet, int row, int column)
{
    var result = string.Empty;

    if (theSheet != null)
    {
        var rng = theSheet.Cells[row, column] as Excel.Range;

        if (rng != null)
            result = (string) rng.Text;
    }

    return result;
}

回答5:

 try
 {

    dynamic mycell = Globals.Sheet1.Cells[7, 7];
    double num;
    if (mycell.Value == null) return; //you can use mycell.Text too.

    if (double.TryParse(mycell.Text, out num)) 
    {
          .
          .
          .
    }
}
catch (Exception e)
{
       MessageBox.Show(e.ToString());
}

来源：https://stackoverflow.com/questions/4341785/how-to-best-fetch-a-cell-value-from-excel-using-vsto

标签

excel

vsto