// // This code is part of Document Solutions for Word demos. // Copyright (c) MESCIUS inc. All rights reserved. // using System; using System.IO; using System.Drawing; using System.Collections.Generic; using System.Linq; using System.Globalization; using GrapeCity.Documents.Word; namespace DsWordWeb.Demos { // This example shows how to deal with the 'data source with this name already exists' error. public class DataTplFixNoDataSources { // Code demonstrating the problem: GcWordDocument Problem() { using var oceans = File.OpenRead(Path.Combine("Resources", "data", "oceans.json")); var doc = new GcWordDocument(); doc.Body.Paragraphs.Add("{{ds.name}}"); // Incorrect: no data sources have been added when the DataTemplate.Process() method is called: doc.DataTemplate.Process(CultureInfo.GetCultureInfo("en-US")); return doc; } // Code demonstrating the fix: GcWordDocument Fix() { using var oceans = File.OpenRead(Path.Combine("Resources", "data", "oceans.json")); var doc = new GcWordDocument(); doc.Body.Paragraphs.Add("{{ds.name}}"); doc.DataTemplate.DataSources.Add("ds", oceans); // Correct: the data source have been added prior to calling the DataTemplate.Process() method: doc.DataTemplate.Process(CultureInfo.GetCultureInfo("en-US")); return doc; } public GcWordDocument CreateDocx() { GcWordDocument doc; try { // This fails: doc = Problem(); } catch (Exception ex) { // This works: doc = Fix(); // Insert a brief explanation of the problem and the fix into the generated document: doc.Body.Paragraphs.Insert( $"The error \"{ex.Message}\" occurred because the DataTemplate.Process() method was called before adding the data source. " + $"The fix is to add the data sources prior to calling the DataTemplate.Process() method.", doc.Styles[BuiltInStyleId.BlockText], InsertLocation.Start); } return doc; } } }