SQL Server不处理NText，Text，Xml或Image数据类型的比较

问题描述：

当数据绑定转发器时发生此错误: SQL Server无法处理NText，Text，Xml或Image数据类型的比较

This error occurs when data binding a repeater: SQL Server does not handle comparison of NText, Text, Xml, or Image data types

protected void Page_Load(object sender, EventArgs e)
{
    topicid = Convert.ToInt32(Request.QueryString["topic".ToString()]);

    if (!IsPostBack)
    {
        MusicForumDataContext db = new MusicForumDataContext();

        var query = from p in db.posts
                    where p.categoryid == NAME
                    select p;
        rptposts.DataSource = query;
        rptposts.DataBind(); <---- ERROR
    }
}

答

NTEXT，TEXT和IMAGE类型已被弃用，必须将其替换为NVARCHAR(MAX)，VARCHAR(MAX)和VARBINARY(MAX)类型.新类型支持字符串运算符，包括相等性比较.

NTEXT, TEXT and IMAGE types are deprecated and must be replaced with the NVARCHAR(MAX), VARCHAR(MAX) and VARBINARY(MAX) types. The new types support string operators, including equality comparison.

XML绝不能作为字符串进行比较. XML片段可以以数千种方式编写，并且在语义上以相同的XML生成.只是想一想命名空间以及如何可以随意声明它们.

XML can never be compared as a string. XML snippets can be written in thousands of ways and result semantically in the same XML. Just think at namespaces and how they can be declared however one likes.

SQL Server不处理NText，Text，Xml或Image数据类型的比较

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