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Detect file exist or not

Posted on 2016-10-06
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Last Modified: 2016-10-06
Hi,
I want to check if relevant SpreadsheetDocument is existing or not, per given filepath (having both full path and document name). Only if the file does not exist, then I create it. Otherwise, I just open it. What to adjust below?
        public static void CreateSpreadsheetWorkbook(string filepath,string SheetName0)
        {
                SpreadsheetDocument spreadsheetDocument = SpreadsheetDocument.
                    Create(filepath, SpreadsheetDocumentType.Workbook);

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Question by:HuaMinChen
  • 2
3 Comments
 
LVL 56

Accepted Solution

by:
Ryan Chong earned 1500 total points
ID: 41831303
try use System.IO.File.Exists to check the existence of the file, like:

public static void CreateSpreadsheetWorkbook(string filepath,string SheetName0)
        {
            if (System.IO.File.Exists(filepath) == false) { // file does not exist
                SpreadsheetDocument spreadsheetDocument = SpreadsheetDocument.
                    Create(filepath, SpreadsheetDocumentType.Workbook);

more info:
File.Exists
https://www.dotnetperls.com/file-exists
0
 
LVL 11

Author Comment

by:HuaMinChen
ID: 41831319
Thanks.
How to resolve

Error	1	Embedded statement cannot be a declaration or labeled statement	C:\App\WindowsFormsApplication9_4_0\WindowsFormsApplication2\Form1.cs	389	21	WindowsFormsApplication2

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due to last line below?
        public static void CreateSpreadsheetWorkbook(string filepath,string SheetName0)
        {
                SpreadsheetDocument spreadsheetDocument = SpreadsheetDocument.
                    Create(filepath, SpreadsheetDocumentType.Workbook);

                if (System.IO.File.Exists(filepath) == false)
                {
                    // Create a spreadsheet document by supplying the filepath.
                    // By default, AutoSave = true, Editable = true, and Type = xlsx.
                    SpreadsheetDocument spreadsheetDocument = SpreadsheetDocument.
                        Create(filepath, SpreadsheetDocumentType.Workbook);
                }
                else
                    SpreadsheetDocument spreadsheetDocument = SpreadsheetDocument.Open(filepath, false);

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0
 
LVL 56

Expert Comment

by:Ryan Chong
ID: 41831323
try this instead (quick guess):
        public static void CreateSpreadsheetWorkbook(string filepath,string SheetName0)
        {
                if (System.IO.File.Exists(filepath) == false)
                {
                    // Create a spreadsheet document by supplying the filepath.
                    // By default, AutoSave = true, Editable = true, and Type = xlsx.
                    SpreadsheetDocument spreadsheetDocument = SpreadsheetDocument.
                        Create(filepath, SpreadsheetDocumentType.Workbook);
                }
                else 
              {
                    SpreadsheetDocument spreadsheetDocument = SpreadsheetDocument.Open(filepath, false);
            }
}

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