【发布时间】：2017-03-06 22:56:57
【问题描述】：
Sql Server 的变量 TEST_TIME 数据类型为 Time(7)
我在 C# 中创建了表，它自动分配了 Timespan 数据类型。
现在，我正在尝试将 csv 文件数据上传到 SQL 数据库，它给了我一个错误“无法将 DateTime 隐式转换为 Timespan”。解决此问题的最佳方法是什么？
用户首先选择 CSV 文件：
private void button8_Click(object sender, EventArgs e)
{
try
{
using (OpenFileDialog openfiledialog1 = new OpenFileDialog()
{Filter = "Excel Workbook 97-2003|*.xls|Excel Workbook|*.xlsx|Excel Workbook|*.xlsm|Excel Workbook|*.csv|Excel Workbook|*.txt", ValidateNames = true })
{
--After some IFs--
else if (openfiledialog1.FilterIndex == 4)
{
DataTable oDataTable = null;
int RowCount = 0;
string[] ColumnNames = null;
string[] oStreamDataValues = null;
//using while loop read the stream data till end
while (!oStreamReader.EndOfStream)
{
String oStreamRowData = oStreamReader.ReadLine().Trim();
if (oStreamRowData.Length > 0)
{
oStreamDataValues = oStreamRowData.Split(',');
//Bcoz the first row contains column names, we will populate
//the column name by
//reading the first row and RowCount-0 will be true only once
if (RowCount == 0)
{
RowCount = 1;
ColumnNames = oStreamRowData.Split(',');
oDataTable = new DataTable();
//using foreach looping through all the column names
foreach (string csvcolumn in ColumnNames)
{
DataColumn oDataColumn = new DataColumn(csvcolumn.ToUpper(), typeof(string));
//setting the default value of empty.string to newly created column
oDataColumn.DefaultValue = string.Empty;
//adding the newly created column to the table
oDataTable.Columns.Add(oDataColumn);
}
}
else
{
//creates a new DataRow with the same schema as of the oDataTable
DataRow oDataRow = oDataTable.NewRow();
//using foreach looping through all the column names
for (int i = 0; i < ColumnNames.Length; i++)
{
oDataRow[ColumnNames[i]] = oStreamDataValues[i] == null ? string.Empty : oStreamDataValues[i].ToString();
}
//adding the newly created row with data to the oDataTable
oDataTable.Rows.Add(oDataRow);
}
}
}
result.Tables.Add(oDataTable);
//close the oStreamReader object
oStreamReader.Close();
//release all the resources used by the oStreamReader object
oStreamReader.Dispose();
dataGridView5.DataSource = result.Tables[oDataTable.TableName];
}
代码如下：
private void button9_Click(object sender, EventArgs e)
{
try
{
DataClasses1DataContext conn = new DataClasses1DataContext();
else if (textBox3.Text.Contains("GEN_EX"))
{
foreach (DataTable dt in result.Tables)
{
foreach (DataRow dr in dt.Rows)
{
GEN_EX addtable = new GEN_EX()
{
EX_ID = Convert.ToByte(dr[0]),
DOC_ID = Convert.ToByte(dr[1]),
PATIENT_NO = Convert.ToByte(dr[2]),
TEST_DATE = Convert.ToDateTime(dr[3]),
**TEST_TIME = Convert.ToDateTime((dr[4])),**
};
conn.GEN_EXs.InsertOnSubmit(addtable);
}
}
conn.SubmitChanges();
MessageBox.Show("File uploaded successfully");
}
else
{
MessageBox.Show("I guess table is not coded yet");
}
}
编辑
TEST_TIME 代表 HH:MM:SS
类型化数据集定义为：
public virtual int Update(
byte EX_ID,
byte DOC_ID,
byte PATIENT_NO,
System.DateTime TEST_DATE,
System.TimeSpan TEST_TIME)
【问题讨论】：
-
做一个
dr[4].GetType()，看看DataRow中包含的类型是什么 -
什么返回
dt.Columns[4].DataType属性？ -
您要在该列中放入什么数据？ （即它不喜欢的 csv 中有什么值）
-
属性类型是
TEST_TIMETimeSpan吗？Convert.ToDateTime将返回DateTime并且您不能直接将 DateTime 转换为 TimeSpan。 DateTime 表示特定时间和日期的值，而 TimeSpance 表示以小时、分钟、秒和毫秒为单位的持续时间。 -
如果
TEST_TIME是TimeSpan那么你为什么要在其中添加DateTime？
标签： c# sql-server datetime timespan