英文:
Updating Value of XML Tag in C#
问题
I am using a XML file as the main configuration (config.xml) source in my C# project, and therefore I need to be able to read data from and write data to this file. Included is the beginning of my XML which contains the tag I would like to update from within the app.
<?xml version="1.0" encoding="utf-8"?><root><startupparams><backColor>white</backColor> <!-- Tag to update --><foreColor>black</foreColor></startupparams><strings><appTitle>TheCalc</appTitle><appAuthor>Matthew Croft</appAuthor><appGreeting>Welcome</appGreeting></strings>
The problem is that I am not too familiar with C# and XML integration, and writing (or more accurately updating) the tags to the file is the process that is causing me issue as I am not able to successfully do it. What I tried is included below.
Console.Write("Background Color: ");string background = Console.ReadLine()!;Console.WriteLine(background);Console.WriteLine();Console.Write("Foreground Color: ");string foreground = Console.ReadLine()!;XmlNodeList backColors = config.GetElementsByTagName("backColor");for (int i = 0; i < backColors.Count; i++){backColors[i].InnerText = background;}
Keep in mind that I have already opened the XML by using the following.
XmlDocument config = new XmlDocument();string configFilePath = @"C:\Users\mcroftdev\Documents\TheCalc\config.xml";config.Load(configFilePath);
Any suggestions you can provide would be greatly appreciated. Thank you in advance!
英文:
I am using a XML file as the main configuration (config.xml) source in my C# project, and therefore I need to be able to read data from and write data to this file. Included is the beginning of my XML which contains the tag I would like to update from within the app.
<?xml version="1.0" encoding="utf-8"?><root><startupparams><backColor>white</backColor>``` < -- Tag to update``` <foreColor>black</foreColor></startupparams><strings><appTitle>TheCalc</appTitle><appAuthor>Matthew Croft</appAuthor><appGreeting>Welcome</appGreeting>
The problem is that I am not too familiar with C# and XML integration, and writing (or more accurately updating) the tags to the file is the process that is causing me issue as I am not able to successfully do it. What I tried is included below.
Console.Write("Background Color: ");string background = Console.ReadLine()!;Console.WriteLine(background);Console.WriteLine();Console.Write("Foreground Color: ");string foreground = Console.ReadLine()!;XmlNodeList backColors = config.GetElementsByTagName("backColor");for (int i = 0; i < backColors.Count; i++){backColors[i].InnerText = background;}
Keep in mind that I have already opened the XML by using the following.
XmlDocument config = new XmlDocument();string configFilePath = @"C:\Users\mcroftdev\Documents\TheCalc\config.xml";config.Load(configFilePath);
Any suggestions you can provide would be greatly appreciated. Thank you in advance!
答案1
得分: 1
XML中的注释使其无效。但您可能只是为了在您的帖子中进行文档记录而这样做。为了测试，我在Notepad++中创建了这个文件。Notepad++可以告诉您您的XML文件是否包含错误：
这是我使用的代码。主要更改是在末尾添加了保存操作。使用正确的XML文件并添加保存操作后，代码按预期工作。
XmlDocument config = new XmlDocument();string configFilePath = @"d:\test.xml";config.Load(configFilePath);XmlNodeList backColors = config.GetElementsByTagName("backColor");for (int i = 0; i < backColors.Count; i++){backColors[i].InnerText = "new background";}config.Save(configFilePath);
英文:
The commenting in your xml made it invalid. But you may have done that just for documentation in your post. For testing I created this file in Notepad++. Notepad++ can tell you if your XML file contains errors:
This is the code I used. The primary change was to add a Save at the end. With a proper XML file and adding the Save the code works as intended.
XmlDocument config = new XmlDocument();string configFilePath = @"d:\test.xml";config.Load(configFilePath);XmlNodeList backColors = config.GetElementsByTagName("backColor");for (int i = 0; i < backColors.Count; i++){backColors[i].InnerText = "new background";}config.Save(configFilePath);
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