Object reference not set to an instance of an object.

最新推荐文章于 2025-03-10 22:50:35 发布

WDBS_05

最新推荐文章于 2025-03-10 22:50:35 发布

阅读量4.8k

点赞数

CC 4.0 BY-SA版权

分类专栏： C# 文章标签： reference object exception dataset tree server

本文链接：https://blog.youkuaiyun.com/WDBS_05/article/details/7696037

C# 专栏收录该内容

48 篇文章

订阅专栏

本文记录了一次Web请求执行过程中发生的NullReferenceException异常详情，该异常源于尝试访问一个未初始化的对象实例。具体涉及的问题是在ASP.NET中使用XmlDataSource加载数据到Tree控件时出现的错误。文章包含了错误的堆栈跟踪及代码片段，有助于理解错误发生的原因。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

Object reference not set to an instance of an object.

未將對象引用設置到對象的實例

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

aspx页：

<ext:Tree ID="Tree1" runat="server" AutoScroll="true" EnableArrows="true" Title="Tree">
</ext:Tree>

<asp:XmlDataSource ID="XmlDataSource1" runat="server" DataFile="~/menu.xml">
</asp:XmlDataSource>

cs页面：

DataSet ds = new DataSet();
string path = Server.MapPath("menu.xml");
ds.ReadXml(path);
Tree1.DataSource = ds;
Tree1.DataBind();

//Tree1.DataSource = ds;
//Tree1.DataSource = XmlDataSource1;

求解？？？？