//// This code is part of Document Solutions for Word demos.// Copyright (c) MESCIUS inc. All rights reserved.//using System;using System.IO;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 DataTplFixSpecifyDataSource    {        // Code demonstrating the problem:        GcWordDocument Problem()        {            using var oceans = File.OpenRead(Path.Combine("Resources", "data", "oceans.json"));            using var oceans1 = File.OpenRead(Path.Combine("Resources", "data", "oceans.json"));            var doc = new GcWordDocument();            doc.DataTemplate.DataSources.Add("ds", oceans);            doc.DataTemplate.DataSources.Add("ds1", oceans1);            // Incorrect: template tag is used without specifying the data source part.            // It is allowed only if the template engine is able to resolve the tags.            // But because in this case there are two data sources that both contain a field called 'name',            // if causes an exception as the tag cannot be resolved:            doc.Body.Paragraphs.Add("{{name}}");            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"));            using var oceans1 = File.OpenRead(Path.Combine("Resources", "data", "oceans.json"));            var doc = new GcWordDocument();            doc.DataTemplate.DataSources.Add("ds", oceans);            doc.DataTemplate.DataSources.Add("ds1", oceans1);            // Correct: use fully qualified data tags so there is no ambiguity:            doc.Body.Paragraphs.Add("{{ds.name}}");            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 data template engine could not unambiguously resolve the data tag " +                    $"that was not fully qualified. " +                    $"The fix is to use fully qualified data tags.",                    doc.Styles[BuiltInStyleId.BlockText],                    InsertLocation.Start);            }            return doc;        }    }}