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Clear all RelId's if workbook is loaded from template. #1172

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Just for now

@@ -110,7 +110,7 @@ public static IXLOutline DefaultOutline

public static XLWorkbook OpenFromTemplate(String path)
return new XLWorkbook(path, true);
return new XLWorkbook(path, asTemplate: true);

#endregion Static
@@ -52,6 +52,33 @@ private void LoadSheetsFromTemplate(String fileName)
using (var dSpreadsheet = SpreadsheetDocument.CreateFromTemplate(fileName))

// If we load a workbook as a template, we have to treat it as a "new" workbook.
// The original file will NOT be copied into place before changes are applied
// Hence all loaded RelIds have to be cleared

private void ResetAllRelIds()
foreach (var ws in Worksheets.Cast<XLWorksheet>())
ws.SheetId = 0;
ws.RelId = null;

foreach (var pt in ws.PivotTables.Cast<XLPivotTable>())
pt.WorkbookCacheRelId = null;
pt.CacheDefinitionRelId = null;
pt.RelId = null;

foreach (var picture in ws.Pictures.Cast<XLPicture>())
picture.RelId = null;

foreach (var table in ws.Tables.Cast<XLTable>())
table.RelId = null;

private void LoadSpreadsheetDocument(SpreadsheetDocument dSpreadsheet)
@@ -72,10 +72,17 @@ public static void RunTestExample<T>(string filePartName, bool evaluateFormulae

filePath1 = Path.Combine(directory, "z" + fileName);
var filePath2 = Path.Combine(directory, fileName);

//Run test
using (var wb = new XLWorkbook(filePath1))
wb.SaveAs(filePath2, true, evaluateFormulae);
wb.SaveAs(filePath2, validate: true, evaluateFormulae);

// Also load from template and save it again - but not necessary to test against reference file
// We're just testing that it can save.
using (var ms = new MemoryStream())
using (var wb = XLWorkbook.OpenFromTemplate(filePath1))
wb.SaveAs(ms, validate: true, evaluateFormulae);

if (CompareWithResources)
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