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我突然开始在我的 PC 上的多个 C# 项目中出现以下错误：

System.Data.dll 中发生“System.OverflowException”类型的未处理异常附加信息：算术运算导致溢出。

我尝试使用 .Net 框架 4、3.5、3 和 4.5 运行我的项目，但总是出现相同的错误。在处理我的 SQL Server 数据库时，在一个项目中使用 dataadapter 填充数据表时总是出现该错误，而在另一个项目中尝试打开连接时总是会出现该错误。这是一个示例代码：

        string strConn = "Data Source=Home\\SqlExpress;Initial Catalog=PatientDBNew;Integrated Security=True";
        SqlConnection conn = new SqlConnection(strConn);
        string sql = string.Format("Select 'file:///' + FolderPath + PhotoName As PhotoPath From Patient Inner Join Photo On Patient.FileNumber = Photo.FileNumber Where Patient.FileNumber = '{0}' And BeforeOrAfter = {1} Order by DateTimeAdded Asc", Patient.FileNumber, beforeOrAfter);
        SqlDataAdapter da = new SqlDataAdapter(sql, conn); ;
        DataTable dt = null;

        try
        {
            dt = new DataTable();
            da.Fill(dt); //**here I get the exception**
        }
        catch (Exception ex)
        {
            ErrorLog("MethodName", ex);
        }

这是来自另一个项目：

        string strConn = "Data Source=Home\\SqlExpress;Initial Catalog=PatientDB;Integrated Security=True";
        SqlConnection conn = new SqlConnection(strConn);
        string sql = string.Format("Select Replace([Filenumber], 'A', '20'), [Bphoto_issuing_date], [Aphoto_issuing_date] From [Patient_Master] Where FileNumber like 'A%' Order by FileNumber");
        SqlDataAdapter da = new SqlDataAdapter(sql, conn);
        DataTable dt = new DataTable();
        da.Fill(dt); //**Here I don't get an exception!**

        strConn = "Data Source=MSD-Home;Initial Catalog=PatientDBNew;Integrated Security=True";
        conn = new SqlConnection(strConn);

        foreach (DataRow item in dt.Rows)
        {
            string fileNb = item[0].ToString();
            string startOfTreatment = item[1].ToString();
            string endOfTreatment = item[2].ToString();

            sql = "Update Patient Set BPhotoDate = '" + startOfTreatment + "', APhotoDate = '" + endOfTreatment + "' Where FileNumber = '" + fileNb + "'";

            using (SqlCommand cmd = new SqlCommand(sql))
            {
                cmd.Connection = conn;
                conn.Open(); //**Here I get the exception**
                cmd.ExecuteNonQuery();
                conn.Close();
            }
        }

很明显，在处理 PatientDB 时进展顺利，而在处理 PatientDBNew 时则不然。我试图找出问题所在，但无法。这是我在 PatientDBNew 数据库中的“患者”表结构：

SET ANSI_PADDING ON
GO

CREATE TABLE [dbo].[Patient](
    [FileNumber] [varchar](25) NOT NULL,
    [PhysicianId] [int] NOT NULL,
    [FolderPath] [varchar](MAX) NULL CONSTRAINT [DF_Patient_FolderPath]  DEFAULT (''),
    [BPhotoDate] [datetime] NULL,
    [APhotoDate] [datetime] NULL,
 CONSTRAINT [PK_Patient] PRIMARY KEY CLUSTERED 
(
    [FileNumber] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]

GO

SET ANSI_PADDING OFF
GO

ALTER TABLE [dbo].[Patient]  WITH CHECK ADD  CONSTRAINT [FK_Patient_Physician] FOREIGN KEY([PhysicianId])
REFERENCES [dbo].[Physician] ([PhysicianId])
GO

ALTER TABLE [dbo].[Patient] CHECK CONSTRAINT [FK_Patient_Physician]
GO

FilenNumber 不超过 25 个字符，PhysicianId 始终为 1 或 2，正如我之前所说，直到 2 天前我开始出现此错误时，它一直在运行，没有任何异常。

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