无法切换编码[重复]

Question

我正在从我的 C# 应用程序生成一个 xml，然后将其发送到 SQL Server 存储过程。当存储过程解析xml时，它会抛出错误

XML解析：第1行，字符39，无法切换编码

这就是我生成 XML 的方式。该函数是一个扩展函数。

public static string ToXml<T>(this T obj, string rootName)
{
    XmlSerializer serializer = new XmlSerializer(typeof(T), new XmlRootAttribute(rootName));

    var xmlNs = new XmlSerializerNamespaces();
    xmlNs.Add(string.Empty, string.Empty);

    using (StringWriter sw = new StringWriter())
    {
        serializer.Serialize(sw, obj, xmlNs);
        return sw.ToString();
    }
}

存储过程如下所示：

/*
        SET @Data = '<?xml version="1.0" encoding="utf-16"?>
                    <Students>
                      <Student>
                        <ID>2</ID>
                        <FirstName>Soument</FirstName>
                        <LastName>Sen</LastName>
                        <IsActive>true</IsActive>
                        <StateID>2</StateID>
                        <StateName>Bihar</StateName>
                        <CityID>4</CityID>
                        <CityName>DharBganga</CityName>
                      </Student>
                    </Students>'  

*/
CREATE PROCEDURE [dbo].USP_SaveStudent
(
        @Data               xml,
        @PageNbr            INT = 1,
        @PageSize           INT = 10,
        @SortColumn         NVARCHAR(20) = 'ID',
        @SortOrder          NVARCHAR(4)= 'ASC'  
)
AS
BEGIN TRY
    MERGE INTO Student as Trg  
    USING (SELECT
               d.x.value('id[1]', 'varchar(MAX)') as ID,
               d.x.value('FirstName[1]', 'varchar(MAX)') as FirstName ,  
               d.x.value('LastName[1]', 'varchar(MAX)') as LastName,
               d.x.value('StateID[1]','int') as StateID,
               d.x.value('CityID[1]','int') as CityID,
               d.x.value('IsActive[1]','bit') as IsActive
           FROM
               @Data.nodes('/Students/Student') as  d(x)) AS Src ON Trg.ID = Src.ID  

    WHEN MATCHED THEN
        UPDATE 
            SET Trg.FirstName = Src.FirstName,  
                Trg.LastName = Src.LastName,
                Trg.StateID = Src.StateID,
                Trg.CityID = Src.CityID,
                Trg.IsActive = Src.IsActive

    WHEN NOT MATCHED BY TARGET THEN
        INSERT (FirstName, LastName, StateID, CityID, IsActive) 
        VALUES(Src.FirstName, Src.LastName, Src.StateID, Src.CityID, Src.IsActive);   
END TRY
BEGIN CATCH
    -- Insert Error into table
    --INSERT INTO #error_log(message)
    --VALUES (ERROR_MESSAGE());
END CATCH

EXEC USP_GetStudentData @PageNbr, @PageSize, @SortColumn, @SortOrder

寻求解决方法等指导。谢谢

Answer 1

XML 标头中的encoding="utf-16" 让你丧命。如果需要xml头，可以去掉编码吗？

来自 MSDN 的完整法律术语是 here；关键是 XML 文档中的编码必须与包含 XML 文档的字符串的编码相匹配。