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!！[我的错误消息如何修复此错误，我已检查了数据表、过程，但找不到此错误

procedureName = "InvoiceDetails";
cmdType = CommandType.StoredProcedure;

parameters.Add(new SqlParameter("@InvoiceNo", SqlDbType.Int));//0
parameters.Add(new SqlParameter("@H", SqlDbType.NVarChar, 50));//1
parameters.Add(new SqlParameter("@value", SqlDbType.Decimal ));//2
parameters.Add(new SqlParameter("@ExchangeRate", SqlDbType.Decimal));//3
parameters.Add(new SqlParameter("@Hamount", SqlDbType.Decimal));//4
parameters.Add(new SqlParameter("@HAWBAmountLKR", SqlDbType.Decimal));//5
parameters.Add(new SqlParameter("@Discountamount ", SqlDbType.Decimal));//6
parameters.Add(new SqlParameter("@DisType", SqlDbType.Int));//7
parameters.Add(new SqlParameter("@CurrencyType", SqlDbType.VarChar,(10)));//8
parameters.Add(new SqlParameter("@InvoiceDatetime",SqlDbType.DateTime));//9
parameters.Add(new SqlParameter("@fuel",SqlDbType.Decimal));//10
parameters.Add(new SqlParameter("@Invoicecode", SqlDbType.NVarChar, 30));//11
parameters.Add(new SqlParameter("@InvoiceTotal", SqlDbType.Decimal));//12
parameters.Add(new SqlParameter("@compCode", SqlDbType.NVarChar, 30));//13
parameters.Add(new SqlParameter("@CreateUserID", SqlDbType.NVarChar, 30));//14
parameters.Add(new SqlParameter("@Status", SqlDbType.Int));//15

//Inserting data through stored procedure
parameters[0].Value = 1;//0
parameters[1].Value = DropDownh.SelectedValue.ToString();//1
parameters[2].Value = Double.Parse(txtvalue.Text.Trim());//2
parameters[3].Value = Double.Parse(txtexchage.Text.Trim());//3
parameters[4].Value = Double.Parse(txtUSD.Text.Trim());//4
parameters[5].Value = Double.Parse(txtLKR.Text.Trim());//5
parameters[6].Value = Double.Parse(txtfuel0.Text.Trim());//6
parameters[7].Value = DropDiz.SelectedValue.ToString();//7
parameters[8].Value = "USD";//8
parameters[9].Value = DateTime.Now;//DateStampLabel.Text.Trim().Replace("'", "''"); //9
parameters[10].Value = "0.00";//10
parameters[11].Value = "N/A";//11
parameters[12].Value = "0.00";//12
parameters[13].Value = LblcompCode.Text.Trim().Replace("'", "''");//13
parameters[14].Value = LbluserName.Text.Trim().Replace("'", "''");//14
parameters[15].Value = 0;//15

---

]我怀疑

参数[7]

应该是

int

procedureName = "InvoiceDetails";
cmdType = CommandType.StoredProcedure;

parameters.Add(new SqlParameter("@InvoiceNo", SqlDbType.Int));//0
parameters.Add(new SqlParameter("@H", SqlDbType.NVarChar, 50));//1
parameters.Add(new SqlParameter("@value", SqlDbType.Decimal ));//2
parameters.Add(new SqlParameter("@ExchangeRate", SqlDbType.Decimal));//3
parameters.Add(new SqlParameter("@Hamount", SqlDbType.Decimal));//4
parameters.Add(new SqlParameter("@HAWBAmountLKR", SqlDbType.Decimal));//5
parameters.Add(new SqlParameter("@Discountamount ", SqlDbType.Decimal));//6
parameters.Add(new SqlParameter("@DisType", SqlDbType.Int));//7
parameters.Add(new SqlParameter("@CurrencyType", SqlDbType.VarChar,(10)));//8
parameters.Add(new SqlParameter("@InvoiceDatetime",SqlDbType.DateTime));//9
parameters.Add(new SqlParameter("@fuel",SqlDbType.Decimal));//10
parameters.Add(new SqlParameter("@Invoicecode", SqlDbType.NVarChar, 30));//11
parameters.Add(new SqlParameter("@InvoiceTotal", SqlDbType.Decimal));//12
parameters.Add(new SqlParameter("@compCode", SqlDbType.NVarChar, 30));//13
parameters.Add(new SqlParameter("@CreateUserID", SqlDbType.NVarChar, 30));//14
parameters.Add(new SqlParameter("@Status", SqlDbType.Int));//15

//Inserting data through stored procedure
parameters[0].Value = 1;//0
parameters[1].Value = DropDownh.SelectedValue.ToString();//1
parameters[2].Value = Double.Parse(txtvalue.Text.Trim());//2
parameters[3].Value = Double.Parse(txtexchage.Text.Trim());//3
parameters[4].Value = Double.Parse(txtUSD.Text.Trim());//4
parameters[5].Value = Double.Parse(txtLKR.Text.Trim());//5
parameters[6].Value = Double.Parse(txtfuel0.Text.Trim());//6
parameters[7].Value = DropDiz.SelectedValue.ToString();//7
parameters[8].Value = "USD";//8
parameters[9].Value = DateTime.Now;//DateStampLabel.Text.Trim().Replace("'", "''"); //9
parameters[10].Value = "0.00";//10
parameters[11].Value = "N/A";//11
parameters[12].Value = "0.00";//12
parameters[13].Value = LblcompCode.Text.Trim().Replace("'", "''");//13
parameters[14].Value = LbluserName.Text.Trim().Replace("'", "''");//14
parameters[15].Value = 0;//15

试着这样做：

procedureName = "InvoiceDetails";
cmdType = CommandType.StoredProcedure;

parameters.Add(new SqlParameter("@InvoiceNo", SqlDbType.Int));//0
parameters.Add(new SqlParameter("@H", SqlDbType.NVarChar, 50));//1
parameters.Add(new SqlParameter("@value", SqlDbType.Decimal ));//2
parameters.Add(new SqlParameter("@ExchangeRate", SqlDbType.Decimal));//3
parameters.Add(new SqlParameter("@Hamount", SqlDbType.Decimal));//4
parameters.Add(new SqlParameter("@HAWBAmountLKR", SqlDbType.Decimal));//5
parameters.Add(new SqlParameter("@Discountamount ", SqlDbType.Decimal));//6
parameters.Add(new SqlParameter("@DisType", SqlDbType.Int));//7
parameters.Add(new SqlParameter("@CurrencyType", SqlDbType.VarChar,(10)));//8
parameters.Add(new SqlParameter("@InvoiceDatetime",SqlDbType.DateTime));//9
parameters.Add(new SqlParameter("@fuel",SqlDbType.Decimal));//10
parameters.Add(new SqlParameter("@Invoicecode", SqlDbType.NVarChar, 30));//11
parameters.Add(new SqlParameter("@InvoiceTotal", SqlDbType.Decimal));//12
parameters.Add(new SqlParameter("@compCode", SqlDbType.NVarChar, 30));//13
parameters.Add(new SqlParameter("@CreateUserID", SqlDbType.NVarChar, 30));//14
parameters.Add(new SqlParameter("@Status", SqlDbType.Int));//15

//Inserting data through stored procedure
parameters[0].Value = 1;//0
parameters[1].Value = DropDownh.SelectedValue.ToString();//1
parameters[2].Value = Double.Parse(txtvalue.Text.Trim());//2
parameters[3].Value = Double.Parse(txtexchage.Text.Trim());//3
parameters[4].Value = Double.Parse(txtUSD.Text.Trim());//4
parameters[5].Value = Double.Parse(txtLKR.Text.Trim());//5
parameters[6].Value = Double.Parse(txtfuel0.Text.Trim());//6
parameters[7].Value = DropDiz.SelectedValue.ToString();//7
parameters[8].Value = "USD";//8
parameters[9].Value = DateTime.Now;//DateStampLabel.Text.Trim().Replace("'", "''"); //9
parameters[10].Value = "0.00";//10
parameters[11].Value = "N/A";//11
parameters[12].Value = "0.00";//12
parameters[13].Value = LblcompCode.Text.Trim().Replace("'", "''");//13
parameters[14].Value = LbluserName.Text.Trim().Replace("'", "''");//14
parameters[15].Value = 0;//15

Int.Parse(DropDiz.SelectedValue.ToString())

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向代码中添加断点，调试并查找错误。哪一行出现异常？能否同时添加存储过程？是否确定是参数而不是存储过程本身？在该过程的开始处放置一个

返回值

，这样您可以获得参数值，但跳过处理。然后再试一次。我在asp.net中添加断点并将此错误从“Double”转换为“DateTime”，然后检查存储过程和数据表是否正常。例外情况是“从'Double'到'DateTime'的转换无效”，这可能也适用于#10和#12，但两者都不应生成确切的消息。相同的错误{“未能将参数值从Double转换为DateTime。”}注释存储过程和代码中的所有参数，然后按照@hans kesting所说的从存储过程开始返回。然后从两侧逐个取消注释每个参数。它将帮助您了解哪个参数是有问题的