有人可以告訴我爲什麼這是拋出一個空引用異常(對象引用未設置爲對象的實例)。我的代碼讀取一個簡單的XML文件,然後應該將2個元素內的文本傳遞給另一個方法。然而,在foreach循環的第一行拋出異常:這是爲什麼拋出空引用異常?
請原諒我的無知,我是新的。 :)
private void openProjectToolStripMenuItem_Click(object sender, EventArgs e)
{
//I have to pass 'this' (which is Form1) when creating the Projects (Form2) in order for them to understand/see each other
Projects myProjects = new Projects(this);
//displays the Form 2 (called Projects)
myProjects.Show();
XmlDocument xdoc = new XmlDocument();
xdoc.Load("O:\\TestDaws\\projects.xml");
string projList = "/Projects/Project";
XmlNodeList xprojects = xdoc.SelectNodes(projList);
foreach (XmlNode xNodeName in xprojects)
{
string projectname = xNodeName.SelectNodes("/ProjectName")[0].InnerText.ToString();
string projecttype = xNodeName.SelectNodes("/ProjectType")[0].InnerText.ToString();
myProjects.buildProjectList(projectname, projecttype);
}
}
你是否設置了一個斷點並在進入'foreach'循環之前檢查'xprojects'是否爲空? – DGibbs 2013-02-14 11:31:28
你在哪裏得到null? – DarthVader 2013-02-14 11:31:42
@DarthVader從OP:'但是異常拋出在foreach循環的第一行' – DGibbs 2013-02-14 11:32:07