有些数据无法放入数据库列中(小)。要发现哪里有问题并不容易。如果你使用c#和Linq2Sql，你可以列出将被截断的字段:

首先创建helper类:

public class SqlTruncationExceptionWithDetails : ArgumentOutOfRangeException
{
    public SqlTruncationExceptionWithDetails(System.Data.SqlClient.SqlException inner, DataContext context)
        : base(inner.Message + " " + GetSqlTruncationExceptionWithDetailsString(context))
    {
    }

    /// <summary>
    /// PArt of code from following link
    /// http://stackoverflow.com/questions/3666954/string-or-binary-data-would-be-truncated-linq-exception-cant-find-which-fiel
    /// </summary>
    /// <param name="context"></param>
    /// <returns></returns>
    static string GetSqlTruncationExceptionWithDetailsString(DataContext context)
    {
        StringBuilder sb = new StringBuilder();

        foreach (object update in context.GetChangeSet().Updates)
        {
            FindLongStrings(update, sb);
        }

        foreach (object insert in context.GetChangeSet().Inserts)
        {
            FindLongStrings(insert, sb);
        }
        return sb.ToString();
    }

    public static void FindLongStrings(object testObject, StringBuilder sb)
    {
        foreach (var propInfo in testObject.GetType().GetProperties())
        {
            foreach (System.Data.Linq.Mapping.ColumnAttribute attribute in propInfo.GetCustomAttributes(typeof(System.Data.Linq.Mapping.ColumnAttribute), true))
            {
                if (attribute.DbType.ToLower().Contains("varchar"))
                {
                    string dbType = attribute.DbType.ToLower();
                    int numberStartIndex = dbType.IndexOf("varchar(") + 8;
                    int numberEndIndex = dbType.IndexOf(")", numberStartIndex);
                    string lengthString = dbType.Substring(numberStartIndex, (numberEndIndex - numberStartIndex));
                    int maxLength = 0;
                    int.TryParse(lengthString, out maxLength);

                    string currentValue = (string)propInfo.GetValue(testObject, null);

                    if (!string.IsNullOrEmpty(currentValue) && maxLength != 0 && currentValue.Length > maxLength)
                    {
                        //string is too long
                        sb.AppendLine(testObject.GetType().Name + "." + propInfo.Name + " " + currentValue + " Max: " + maxLength);
                    }

                }
            }
        }
    }
}

然后为SubmitChanges准备包装器:

public static class DataContextExtensions
{
    public static void SubmitChangesWithDetailException(this DataContext dataContext)
    {
        //http://stackoverflow.com/questions/3666954/string-or-binary-data-would-be-truncated-linq-exception-cant-find-which-fiel
        try
        {
            //this can failed on data truncation
            dataContext.SubmitChanges();
        }       
        catch (SqlException sqlException) //when (sqlException.Message == "String or binary data would be truncated.")
        {

            if (sqlException.Message == "String or binary data would be truncated.") //only for EN windows - if you are running different window language, invoke the sqlException.getMessage on thread with EN culture
                throw new SqlTruncationExceptionWithDetails(sqlException, dataContext);
            else
                throw;
        }
    }
}

准备全局异常处理程序和日志截断细节:

protected void Application_Error(object sender, EventArgs e)
{
    Exception ex = Server.GetLastError();
    string message = ex.Message;
    //TODO - log to file
}

最后使用代码:

Datamodel.SubmitChangesWithDetailException();

在sql server上，你可以像这样使用SET ANSI_WARNINGS OFF:

        using (SqlConnection conn = new SqlConnection("Data Source=XRAYGOAT\\SQLEXPRESS;Initial Catalog='Healthy Care';Integrated Security=True"))
        {
            conn.Open();

            using (var trans = conn.BeginTransaction())
            {
                try
                {
                    using cmd = new SqlCommand("", conn, trans))
                    { 

                    cmd.CommandText = "SET ANSI_WARNINGS OFF";
                    cmd.ExecuteNonQuery();

                    cmd.CommandText = "YOUR INSERT HERE";
                    cmd.ExecuteNonQuery();

                    cmd.Parameters.Clear();

                    cmd.CommandText = "SET ANSI_WARNINGS ON";
                    cmd.ExecuteNonQuery();

                    trans.Commit();
                    }
                }
                catch (Exception)
                {

                    trans.Rollback();
                }

            }

            conn.Close();

        }

你可以得到这个错误的另一种情况是:

我也犯了同样的错误，原因是在一个从UNION接收数据的INSERT语句中，列的顺序与原始表不同。如果您将#table3中的顺序更改为a, b, c，则可以修复错误。

select a, b, c into #table1
from #table0

insert into #table1
    select a, b, c from #table2
    union
    select a, c, b from #table3

也有这个问题发生在web应用程序表面。 最终发现相同的错误消息来自特定表中的SQL更新语句。

最后发现在某些特定情况下，相关历史表中的列定义没有映射nvarchar类型的原始表列长度。

在其中一个INSERT语句中，您试图将一个太长的字符串插入到字符串(varchar或nvarchar)列中。

如果仅仅通过查看脚本还不清楚哪个INSERT是违规者，那么可以计算错误消息之前出现的<1行受影响的>行。得到的数字加1就是陈述号。在您的例子中，似乎是第二个INSERT产生了错误。

我也有同样的问题。我的专栏太短了。

您所能做的就是增加或缩短想要放入数据库中的文本的长度。