NPOI.OpenXml4Net.Exceptions.OpenXML4NetRuntimeException:“Fail to save: an error occurs while saving the package : Must support writing

源代码

           string fileContent = File.ReadAllText(filePath, Encoding.Default);

            Dictionary<string, string> dic = ConvertToKeyValuePairs(fileContent);

            File.Copy(srcPath, dstPath, true);

            using (FileStream fileStream = new FileStream(dstPath, FileMode.Open, FileAccess.ReadWrite))
            {
                 doc = new XWPFDocument(fileStream);

                foreach (var item in dic)
                {
                    if (String.IsNullOrEmpty(item.Value))
                    {
                        continue;
                    }

                    TextReplace($"{{{item.Key}}}", item.Value);
                }
                doc.Write(fileStream);
            }

不值得为啥不支持写
NPOI.OpenXml4Net.Exceptions.OpenXML4NetRuntimeException:“Fail to save: an error occurs while saving the package : Must support writing
参数名: baseOutputStream”

修改2

            Dictionary<string, string> dic = ConvertToKeyValuePairs(fileContent);

            File.Copy(srcPath, dstPath, true);

            using (FileStream fileStream = new FileStream(srcPath, FileMode.Open, FileAccess.ReadWrite))
            {
                 doc = new XWPFDocument(fileStream);

                foreach (var item in dic)
                {
                    if (String.IsNullOrEmpty(item.Value))
                    {
                        continue;
                    }

                    TextReplace($"{{{item.Key}}}", item.Value);
                }
                
            }

            using (FileStream fileStreamWrite = new FileStream(dstPath, FileMode.Open, FileAccess.Write))
            {
                doc.Write(fileStreamWrite);
            }

还是不行，输出乱码，感觉是FileMode.Open问题。

终版正常运行，直接创建了一个新的流。

            string fileContent = File.ReadAllText(filePath, Encoding.Default);

            Dictionary<string, string> dic = ConvertToKeyValuePairs(fileContent);

            using (FileStream fileStream = new FileStream(srcPath, FileMode.Open, FileAccess.ReadWrite))
            {
                 doc = new XWPFDocument(fileStream);

                foreach (var item in dic)
                {
                    if (String.IsNullOrEmpty(item.Value))
                    {
                        continue;
                    }

                    TextReplace($"{{{item.Key}}}", item.Value);
                }
                
            }

            using (FileStream fileStreamWrite = new FileStream(dstPath, FileMode.Create, FileAccess.Write))
            {
                doc.Write(fileStreamWrite);
            }