例外：
应用程序中的服务器错误。Object reference not set to an instance of an object.
描述：执行当前Web请求期间发生了未处理的异常。请查看堆栈跟踪以获取有关错误及其源自代码的位置的更多信息。
异常详细信息：System.NullReferenceException：未将对象引用设置为对象的实例。
Source Error:
Line 96: }
Line 97:
Line 98: dtMajlisOrKabinat.Merge(dtTotalsalaries);
Line 99: dtMajlisOrKabinat.AcceptChanges();
Line 100: SqlDataAdapter querycountSalDays = new SqlDataAdapter("select count(distinct CONVERT(varchar,Convert(datetime,InsertedOn,103),103)) as SalaryDate from [SALARY EMP] join Hierarchy on [SALARY EMP].BCODE = Hierarchy.BCODE where SMonth = " + monthvar + " and SYear = " + yearvar + " and gender= " + gender + " AND (UAdmin like '%" + uname + "%' or UserGroup like '%" + uname + "%')", MyGlobalVariables.con);
Source File: F:\Web Payroll\WebPayroll080316\WebPayroll080316 current\WebPayroll080316\DGrid.aspx.cs Line: 98
Stack Trace:
[NullReferenceException: Object reference not set to an instance of an object.]
System.Data.Merger.MergeSchema(DataTable table) +1323
System.Data.Merger.MergeTableData(DataTable src) +36
System.Data.Merger.MergeTable(DataTable src) +181
System.Data.DataTable.Merge(DataTable table, Boolean preserveChanges, MissingSchemaAction missingSchemaAction) +161
System.Data.DataTable.Merge(DataTable table) +13
WebPayroll080316.DGrid.btnshowgrid_Click(Object sender, EventArgs e) in F:\Web Payroll\WebPayroll080316\WebPayroll080316 current\WebPayroll080316\DGrid.aspx.cs:98
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +9696694
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +204
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +12
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +15
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +35
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1639
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.6.1055.0`
异常细节
.Cs代码
using System;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Web.UI.WebControls;
namespace mynamespace
{
public partial class GridViewClass : System.Web.UI.Page
{
static int gender = 1;
static bool DataLevel = true;
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnshowgrid_Click(object sender, EventArgs e)
{
string constr = "Data Source= MyMachineName,1433;Initial Catalog= dbname;Connection Timeout=1 ;User ID= 'username' ;Password= 'password'";
MyGlobalVariables.con = new SqlConnection(constr);
MyGlobalVariables.con.Open();
string uname;
uname = "myuser";
int monthvar = ddlmonth.SelectedIndex + 1;
int yearvar = Convert.ToInt16(ddlyear.SelectedValue);
SqlCommand queryEmpCount;
if(DataLevel)
{
queryEmpCount = new SqlCommand("StoredProDeptAndEmpCount", MyGlobalVariables.con);
}
else
{
queryEmpCount = new SqlCommand("StoredProAreaAndEmpCount", MyGlobalVariables.con);
}
queryEmpCount.CommandType = CommandType.StoredProcedure;
SqlParameter Gender = queryEmpCount.Parameters.AddWithValue("Gender", gender);
SqlParameter Uname = queryEmpCount.Parameters.AddWithValue("Uname", uname);
SqlParameter joindate = queryEmpCount.Parameters.AddWithValue("joindate", "01-05-2016");
SqlDataReader EmpCountdata = queryEmpCount.ExecuteReader();
DataTable dtDeptorArea = new DataTable();
dtDeptorArea.Load(EmpCountdata);
if(dtDeptorArea.Rows.Count > 0)
{
SqlDataAdapter queryTotalSalary;
if(DataLevel)
{
dtDeptorArea.PrimaryKey = new DataColumn[] { dtDeptorArea.Columns["DeptCode"] };
queryTotalSalary = new SqlDataAdapter("select Hierarchy.DeptCode , mydate.CountEmptotal from Hierarchy full outer join (select COUNT(EmpCode) as CountEmptotal, Hierarchy.DeptCode from [SALARY EMP] join Hierarchy on Hierarchy.BCODE= [SALARY EMP].BCODE where [SALARY EMP].BCODE in (select BCODE from [SALARY EMP] where (UAdmin like '%" + uname + "%' or UserGroup like '%" + uname + "%') and SMonth = " + monthvar + " and SYear = " + yearvar + " and Hierarchy.gender =" + gender + ") and (UAdmin like '%" + uname + "%' or UserGroup like '%" + uname + "%') and SMonth = " + monthvar + " and SYear = " + yearvar + " group by Hierarchy.DeptCode) as mydate on Hierarchy.DeptCode= mydate.DeptCode where (UAdmin like '%" + uname + "%' or UserGroup like '%" + uname + "%') and gender =" + gender + " group by Hierarchy.Majlisname, Hierarchy.DeptCode, mydate.DeptCode, mydate.CountEmptotal order by Hierarchy.DeptCode", MyGlobalVariables.con);
}
else
{
dtDeptorArea.PrimaryKey = new DataColumn[] { dtDeptorArea.Columns["AreaCode"] };
queryTotalSalary = new SqlDataAdapter("select Hierarchy.AreaCode , mydate.CountEmptotal from Hierarchy full outer join (select COUNT(EmpCode) as CountEmptotal, Hierarchy.AreaCode from [SALARY EMP] join Hierarchy on Hierarchy.BCODE= [SALARY EMP].BCODE where [SALARY EMP].BCODE in (select BCODE from [SALARY EMP] where (UAdmin like '%" + uname + "%' or UserGroup like '%" + uname + "%') and SMonth = " + monthvar + " and SYear = " + yearvar + " and Hierarchy.gender =" + gender + ") and (UAdmin like '%" + uname + "%' or UserGroup like '%" + uname + "%') and SMonth = " + monthvar + " and SYear = " + yearvar + " group by Hierarchy.AreaCode) as mydate on Hierarchy.AreaCode= mydate.AreaCode where (UAdmin like '%" + uname + "%' or UserGroup like '%" + uname + "%') and gender =" + gender + " group by Hierarchy.kbname, Hierarchy.AreaCode, mydate.AreaCode, mydate.CountEmptotal order by Hierarchy.AreaCode", MyGlobalVariables.con);
}
DataTable dtTotalsalaries = new DataTable();
queryTotalSalary.Fill(dtTotalsalaries);
if(DataLevel)
{
dtTotalsalaries.PrimaryKey = new DataColumn[] { dtTotalsalaries.Columns["DeptCode"] };
}
else
{
dtTotalsalaries.PrimaryKey = new DataColumn[] { dtTotalsalaries.Columns["AreaCode"] };
}
dtDeptorArea.Merge(dtTotalsalaries);
dtDeptorArea.AcceptChanges();
grdvsalaryreport.DataSource = dtDeptorArea;
grdvsalaryreport.DataBind();
}
}
注意 all both procedure are working and also successfully filled in data table
此行发生异常：
dtDeptorArea.Merge(dtTotalsalaries);