C# 为什么我的datagrid只填充一行？_C#_Asp.net_Loops

C# 为什么我的datagrid只填充一行？

c# asp.net loops

C# 为什么我的datagrid只填充一行？,c#,asp.net,loops,C#,Asp.net,Loops,它使用多个值多次通过foreach循环，但仅使用一行填充网格 string textLines; string[] textLine; textLines = scannedGuid.Text; textLine = textLines.Split(Environment.NewLine.ToArray(), StringSplitOptions.RemoveEmptyEntries); DataSet ds2

它使用多个值多次通过foreach循环，但仅使用一行填充网格

        string textLines;
        string[] textLine;

        textLines = scannedGuid.Text;

        textLine = textLines.Split(Environment.NewLine.ToArray(), StringSplitOptions.RemoveEmptyEntries);

        DataSet ds2 = null; 
        Database db2 = DatabaseFactory.CreateDatabase("CouponConnectionString");

        Database db2 = DatabaseFactory.CreateDatabase("ConnectionString");
        foreach (string s in textLine)
        {

            try
            {

                DbCommand command2 = db.GetStoredProcCommand("sel_Guid_p");
                db2.AddInParameter(command2, "@pGuid", DbType.String, s);
                ds2 = db2.ExecuteDataSet(command2);


            }

            catch (Exception ex)
            {

            }


        }

        DataGrid1.DataSource = ds2;
        DataBind();

        string textLines;
        string[] textLine;

        textLines = scannedGuid.Text;

        textLine = textLines.Split(Environment.NewLine.ToArray(), StringSplitOptions.RemoveEmptyEntries);

        DataSet ds2 = null; 
        Database db2 = DatabaseFactory.CreateDatabase("CouponConnectionString");

        Database db2 = DatabaseFactory.CreateDatabase("ConnectionString");
        foreach (string s in textLine)
        {

            try
            {

                DbCommand command2 = db.GetStoredProcCommand("sel_Guid_p");
                db2.AddInParameter(command2, "@pGuid", DbType.String, s);
                ds2 = db2.ExecuteDataSet(command2);


            }

            catch (Exception ex)
            {

            }


        }

        DataGrid1.DataSource = ds2;
        DataBind();

因为每次都要覆盖数据集，所以当完成循环时，只有最终的数据集，我认为它只包含一行

        string textLines;
        string[] textLine;

        textLines = scannedGuid.Text;

        textLine = textLines.Split(Environment.NewLine.ToArray(), StringSplitOptions.RemoveEmptyEntries);

        DataSet ds2 = null; 
        Database db2 = DatabaseFactory.CreateDatabase("CouponConnectionString");

        Database db2 = DatabaseFactory.CreateDatabase("ConnectionString");
        foreach (string s in textLine)
        {

            try
            {

                DbCommand command2 = db.GetStoredProcCommand("sel_Guid_p");
                db2.AddInParameter(command2, "@pGuid", DbType.String, s);
                ds2 = db2.ExecuteDataSet(command2);


            }

            catch (Exception ex)
            {

            }


        }

        DataGrid1.DataSource = ds2;
        DataBind();

你想干什么

        string textLines;
        string[] textLine;

        textLines = scannedGuid.Text;

        textLine = textLines.Split(Environment.NewLine.ToArray(), StringSplitOptions.RemoveEmptyEntries);

        DataSet ds2 = null; 
        Database db2 = DatabaseFactory.CreateDatabase("CouponConnectionString");

        Database db2 = DatabaseFactory.CreateDatabase("ConnectionString");
        foreach (string s in textLine)
        {

            try
            {

                DbCommand command2 = db.GetStoredProcCommand("sel_Guid_p");
                db2.AddInParameter(command2, "@pGuid", DbType.String, s);
                ds2 = db2.ExecuteDataSet(command2);


            }

            catch (Exception ex)
            {

            }


        }

        DataGrid1.DataSource = ds2;
        DataBind();

相反，您需要将所有参数放在一个SP中以获取所有参数，或者将多脚本数据集合并到一个数据结构中以填充数据网格。

因为您每次都覆盖数据集，所以当您完成循环时，您只有最终的数据集，我认为它只包含一行

        string textLines;
        string[] textLine;

        textLines = scannedGuid.Text;

        textLine = textLines.Split(Environment.NewLine.ToArray(), StringSplitOptions.RemoveEmptyEntries);

        DataSet ds2 = null; 
        Database db2 = DatabaseFactory.CreateDatabase("CouponConnectionString");

        Database db2 = DatabaseFactory.CreateDatabase("ConnectionString");
        foreach (string s in textLine)
        {

            try
            {

                DbCommand command2 = db.GetStoredProcCommand("sel_Guid_p");
                db2.AddInParameter(command2, "@pGuid", DbType.String, s);
                ds2 = db2.ExecuteDataSet(command2);


            }

            catch (Exception ex)
            {

            }


        }

        DataGrid1.DataSource = ds2;
        DataBind();

你想干什么

        string textLines;
        string[] textLine;

        textLines = scannedGuid.Text;

        textLine = textLines.Split(Environment.NewLine.ToArray(), StringSplitOptions.RemoveEmptyEntries);

        DataSet ds2 = null; 
        Database db2 = DatabaseFactory.CreateDatabase("CouponConnectionString");

        Database db2 = DatabaseFactory.CreateDatabase("ConnectionString");
        foreach (string s in textLine)
        {

            try
            {

                DbCommand command2 = db.GetStoredProcCommand("sel_Guid_p");
                db2.AddInParameter(command2, "@pGuid", DbType.String, s);
                ds2 = db2.ExecuteDataSet(command2);


            }

            catch (Exception ex)
            {

            }


        }

        DataGrid1.DataSource = ds2;
        DataBind();

相反，您需要将所有参数放入一个SP中以获取所有参数，或者将多脚本数据集合并到一个数据结构中以填充数据网格。

我假设这段代码

        string textLines;
        string[] textLine;

        textLines = scannedGuid.Text;

        textLine = textLines.Split(Environment.NewLine.ToArray(), StringSplitOptions.RemoveEmptyEntries);

        DataSet ds2 = null; 
        Database db2 = DatabaseFactory.CreateDatabase("CouponConnectionString");

        Database db2 = DatabaseFactory.CreateDatabase("ConnectionString");
        foreach (string s in textLine)
        {

            try
            {

                DbCommand command2 = db.GetStoredProcCommand("sel_Guid_p");
                db2.AddInParameter(command2, "@pGuid", DbType.String, s);
                ds2 = db2.ExecuteDataSet(command2);


            }

            catch (Exception ex)
            {

            }


        }

        DataGrid1.DataSource = ds2;
        DataBind();

            DbCommand command2 = db.GetStoredProcCommand("sel_Guid_p");
            db2.AddInParameter(command2, "@pGuid", DbType.String, s);
            ds2 = db2.ExecuteDataSet(command2);

正在返回一行

        string textLines;
        string[] textLine;

        textLines = scannedGuid.Text;

        textLine = textLines.Split(Environment.NewLine.ToArray(), StringSplitOptions.RemoveEmptyEntries);

        DataSet ds2 = null; 
        Database db2 = DatabaseFactory.CreateDatabase("CouponConnectionString");

        Database db2 = DatabaseFactory.CreateDatabase("ConnectionString");
        foreach (string s in textLine)
        {

            try
            {

                DbCommand command2 = db.GetStoredProcCommand("sel_Guid_p");
                db2.AddInParameter(command2, "@pGuid", DbType.String, s);
                ds2 = db2.ExecuteDataSet(command2);


            }

            catch (Exception ex)
            {

            }


        }

        DataGrid1.DataSource = ds2;
        DataBind();

仅仅因为你多次调用它，并不意味着有多条记录。您正在覆盖循环执行的所有变量的值

        string textLines;
        string[] textLine;

        textLines = scannedGuid.Text;

        textLine = textLines.Split(Environment.NewLine.ToArray(), StringSplitOptions.RemoveEmptyEntries);

        DataSet ds2 = null; 
        Database db2 = DatabaseFactory.CreateDatabase("CouponConnectionString");

        Database db2 = DatabaseFactory.CreateDatabase("ConnectionString");
        foreach (string s in textLine)
        {

            try
            {

                DbCommand command2 = db.GetStoredProcCommand("sel_Guid_p");
                db2.AddInParameter(command2, "@pGuid", DbType.String, s);
                ds2 = db2.ExecuteDataSet(command2);


            }

            catch (Exception ex)
            {

            }


        }

        DataGrid1.DataSource = ds2;
        DataBind();

也许您可以将数据集的结果放入一个对象（创建一个表示结果的类），然后在循环时，将每个结果对象添加到列表中，然后将该列表绑定到网格

        string textLines;
        string[] textLine;

        textLines = scannedGuid.Text;

        textLine = textLines.Split(Environment.NewLine.ToArray(), StringSplitOptions.RemoveEmptyEntries);

        DataSet ds2 = null; 
        Database db2 = DatabaseFactory.CreateDatabase("CouponConnectionString");

        Database db2 = DatabaseFactory.CreateDatabase("ConnectionString");
        foreach (string s in textLine)
        {

            try
            {

                DbCommand command2 = db.GetStoredProcCommand("sel_Guid_p");
                db2.AddInParameter(command2, "@pGuid", DbType.String, s);
                ds2 = db2.ExecuteDataSet(command2);


            }

            catch (Exception ex)
            {

            }


        }

        DataGrid1.DataSource = ds2;
        DataBind();

例如：

        string textLines;
        string[] textLine;

        textLines = scannedGuid.Text;

        textLine = textLines.Split(Environment.NewLine.ToArray(), StringSplitOptions.RemoveEmptyEntries);

        DataSet ds2 = null; 
        Database db2 = DatabaseFactory.CreateDatabase("CouponConnectionString");

        Database db2 = DatabaseFactory.CreateDatabase("ConnectionString");
        foreach (string s in textLine)
        {

            try
            {

                DbCommand command2 = db.GetStoredProcCommand("sel_Guid_p");
                db2.AddInParameter(command2, "@pGuid", DbType.String, s);
                ds2 = db2.ExecuteDataSet(command2);


            }

            catch (Exception ex)
            {

            }


        }

        DataGrid1.DataSource = ds2;
        DataBind();

    List<MyCustomerClassForTheReturnedValues> values = new List<MyCustomClassForTheReturnedValues>();

    foreach (string s in textLine)
    {


            DbCommand command2 = db.GetStoredProcCommand("sel_Guid_p");
            db2.AddInParameter(command2, "@pGuid", DbType.String, s);
            MyCustomClassForTheReturnedValues x = new MyCustomClassForTheReturnedValues(db2.ExecuteDataSet(command2));
            values.Add(x);


    }


    DataGrid1.DataSource = values;
    DataGrid1.DataBind();

列表值=新列表（）；
foreach（文本行中的字符串s）
{
DbCommand command2=db.GetStoredProcCommand（“sel_Guid_p”）；
AddInParameter（command2，“@pGuid”，DbType.String，s）；
MyCustomClassForTheReturnedValues x=新的MyCustomClassForTheReturnedValues（db2.ExecuteDataSet（command2））；
加上（x）；
}
DataGrid1.DataSource=值；
DataGrid1.DataBind（）；

我假设这个代码

        string textLines;
        string[] textLine;

        textLines = scannedGuid.Text;

        textLine = textLines.Split(Environment.NewLine.ToArray(), StringSplitOptions.RemoveEmptyEntries);

        DataSet ds2 = null; 
        Database db2 = DatabaseFactory.CreateDatabase("CouponConnectionString");

        Database db2 = DatabaseFactory.CreateDatabase("ConnectionString");
        foreach (string s in textLine)
        {

            try
            {

                DbCommand command2 = db.GetStoredProcCommand("sel_Guid_p");
                db2.AddInParameter(command2, "@pGuid", DbType.String, s);
                ds2 = db2.ExecuteDataSet(command2);


            }

            catch (Exception ex)
            {

            }


        }

        DataGrid1.DataSource = ds2;
        DataBind();

            DbCommand command2 = db.GetStoredProcCommand("sel_Guid_p");
            db2.AddInParameter(command2, "@pGuid", DbType.String, s);
            ds2 = db2.ExecuteDataSet(command2);

正在返回一行

        string textLines;
        string[] textLine;

        textLines = scannedGuid.Text;

        textLine = textLines.Split(Environment.NewLine.ToArray(), StringSplitOptions.RemoveEmptyEntries);

        DataSet ds2 = null; 
        Database db2 = DatabaseFactory.CreateDatabase("CouponConnectionString");

        Database db2 = DatabaseFactory.CreateDatabase("ConnectionString");
        foreach (string s in textLine)
        {

            try
            {

                DbCommand command2 = db.GetStoredProcCommand("sel_Guid_p");
                db2.AddInParameter(command2, "@pGuid", DbType.String, s);
                ds2 = db2.ExecuteDataSet(command2);


            }

            catch (Exception ex)
            {

            }


        }

        DataGrid1.DataSource = ds2;
        DataBind();

仅仅因为你多次调用它，并不意味着有多条记录。您正在覆盖循环执行的所有变量的值

        string textLines;
        string[] textLine;

        textLines = scannedGuid.Text;

        textLine = textLines.Split(Environment.NewLine.ToArray(), StringSplitOptions.RemoveEmptyEntries);

        DataSet ds2 = null; 
        Database db2 = DatabaseFactory.CreateDatabase("CouponConnectionString");

        Database db2 = DatabaseFactory.CreateDatabase("ConnectionString");
        foreach (string s in textLine)
        {

            try
            {

                DbCommand command2 = db.GetStoredProcCommand("sel_Guid_p");
                db2.AddInParameter(command2, "@pGuid", DbType.String, s);
                ds2 = db2.ExecuteDataSet(command2);


            }

            catch (Exception ex)
            {

            }


        }

        DataGrid1.DataSource = ds2;
        DataBind();

也许您可以将数据集的结果放入一个对象（创建一个表示结果的类），然后在循环时，将每个结果对象添加到列表中，然后将该列表绑定到网格

        string textLines;
        string[] textLine;

        textLines = scannedGuid.Text;

        textLine = textLines.Split(Environment.NewLine.ToArray(), StringSplitOptions.RemoveEmptyEntries);

        DataSet ds2 = null; 
        Database db2 = DatabaseFactory.CreateDatabase("CouponConnectionString");

        Database db2 = DatabaseFactory.CreateDatabase("ConnectionString");
        foreach (string s in textLine)
        {

            try
            {

                DbCommand command2 = db.GetStoredProcCommand("sel_Guid_p");
                db2.AddInParameter(command2, "@pGuid", DbType.String, s);
                ds2 = db2.ExecuteDataSet(command2);


            }

            catch (Exception ex)
            {

            }


        }

        DataGrid1.DataSource = ds2;
        DataBind();

例如：

        string textLines;
        string[] textLine;

        textLines = scannedGuid.Text;

        textLine = textLines.Split(Environment.NewLine.ToArray(), StringSplitOptions.RemoveEmptyEntries);

        DataSet ds2 = null; 
        Database db2 = DatabaseFactory.CreateDatabase("CouponConnectionString");

        Database db2 = DatabaseFactory.CreateDatabase("ConnectionString");
        foreach (string s in textLine)
        {

            try
            {

                DbCommand command2 = db.GetStoredProcCommand("sel_Guid_p");
                db2.AddInParameter(command2, "@pGuid", DbType.String, s);
                ds2 = db2.ExecuteDataSet(command2);


            }

            catch (Exception ex)
            {

            }


        }

        DataGrid1.DataSource = ds2;
        DataBind();

    List<MyCustomerClassForTheReturnedValues> values = new List<MyCustomClassForTheReturnedValues>();

    foreach (string s in textLine)
    {


            DbCommand command2 = db.GetStoredProcCommand("sel_Guid_p");
            db2.AddInParameter(command2, "@pGuid", DbType.String, s);
            MyCustomClassForTheReturnedValues x = new MyCustomClassForTheReturnedValues(db2.ExecuteDataSet(command2));
            values.Add(x);


    }


    DataGrid1.DataSource = values;
    DataGrid1.DataBind();

列表值=新列表（）；
foreach（文本行中的字符串s）
{
DbCommand command2=db.GetStoredProcCommand（“sel_Guid_p”）；
AddInParameter（command2，“@pGuid”，DbType.String，s）；
MyCustomClassForTheReturnedValues x=新的MyCustomClassForTheReturnedValues（db2.ExecuteDataSet（command2））；
加上（x）；
}
DataGrid1.DataSource=值；
DataGrid1.DataBind（）；

什么是文本行（即列表等）？我添加了额外的代码来显示文本行。@Tim，lol在这两个问题上都发帖了。这一定是某种家庭作业。SkyDawg33检查你的同学问了同样的问题。什么是文本行（即列表等）？我添加了额外的代码来显示文本行。@Tim，lol在这两个问题上都发帖了。这一定是某种家庭作业。SkyDawg33检查你的同学问了同样的问题。请记住，这将是每个条目一次DB查找。这可能非常低效，具体取决于您的体系结构。如果您可以在存储过程中以单独的方式传递整个guid字符串，并传回整个列表，那么只需一次调用，这会更好。同意薛定谔猫的说法。回答时没有重新设计所有内容：）这是正确的-我只是认为这背后可能还有更重要的问题值得解决。请记住，这将是每个条目一次DB查找。这可能非常低效，具体取决于您的体系结构。如果您可以在存储过程中以单独的方式传递整个guid字符串，并传回整个列表，那么只需一次调用，这会更好。同意薛定谔猫的说法。回答时没有重新设计一切：）这是正确的——我只是认为这背后可能还有更重要的问题值得解决。