Я хочу удалить и вставить запись, но у меня есть ошибка, которая указывает на то, что индекс был вне диапазона. Должен быть неотрицательным и меньше размера коллекции. Имя параметра: индекс Я не могу решить это, пожалуйста, скажите мне, как решить это, и да, у меня есть проблема Обновления изображения, также, пожалуйста, скажите мне, как обновить изображение а также.
Моя команда обновления и удаления Код ЦАП:
public static bool UpdateStudent( string FirstName, string LastName, char Gender, float GPA, Byte[] MyImage)
{
bool success = false;
string sql = "UPDATE Student SET FristName=@prmStudentFirstName,LastName=@prmLastName," +
"Gender = @prmGender,GPA=@prmGPA,MyImage=@prmMyImage" +
"WHERE StudentID=@prmStudentID";
using (SqlCommand command= new SqlCommand(sql,ConnectionManager.GetConnection()))
{
// command.Parameters.Add("@prmStudentID", SqlDbType.Int, 10).Value = StudentID;
command.Parameters.Add("@prmFirstName", SqlDbType.VarChar, 25).Value = FirstName;
command.Parameters.Add("@prmLastName", SqlDbType.VarChar, 25).Value = LastName;
command.Parameters.Add("@prmGender", SqlDbType.Char, 1).Value = Gender;
command.Parameters.Add("@prmGPA", SqlDbType.Float).Value = GPA;
command.Parameters.Add("@prmMyImage", SqlDbType.VarBinary).Value = MyImage;
int rowsAffected = command.ExecuteNonQuery();
success = (rowsAffected == 1);
}
return success;
}
public static bool DeleteStudent(string StudentID)
{
bool success = false;
string sql = "DELETE FROM Student WHERE StudentID= @prmStudentID";
using (SqlCommand command = new SqlCommand(sql, ConnectionManager.GetConnection()))
{
command.Parameters.Add("@prmStudentID", SqlDbType.Int, 10).Value = StudentID;
int rowAffected = command.ExecuteNonQuery();
success = (rowAffected == 1);
}
return success;
}
}
Мой код aspx.cs -
protected void studentGridview_RowEditing(object sender, GridViewEditEventArgs e)
{
StudentGridView.EditIndex = e.NewEditIndex;
DisplayStudentInformation();
}
protected void studentGridview_RowCancelEdit(object sender, GridViewCancelEditEventArgs e)
{
StudentGridView.EditIndex = -1;
DisplayStudentInformation();
}
protected void studentGridview_RowUpdating(object sender, GridViewUpdateEventArgs e)
{ //Index was out of range. Must be non-negative and less than the size of the collection.
//Parameter name: index
string StudentID = ((Label)StudentGridView.Rows[e.RowIndex].Cells[0].FindControl("txtStudentID")).Text.ToString();
string FirstName = ((TextBox)StudentGridView.Rows[e.RowIndex].Cells[1].FindControl("txtStudentFName")).Text;
string LastName = ((TextBox)StudentGridView.Rows[e.RowIndex].Cells[2].FindControl("txtStudentLName")).Text;
string Gender = ((TextBox)StudentGridView.Rows[e.RowIndex].Cells[3].FindControl("txtStudentGender")).Text;
string GPA = ((TextBox)StudentGridView.Rows[e.RowIndex].Cells[4].FindControl("txtStudentGPA")).Text;
//Problem as at blow line I cant set the Image for Updating it
string MyImage = ((System.Web.UI.WebControls.Image)StudentGridView.Rows[e.RowIndex].Cells[5].FindControl("Image")).ImageUrl;
char studentGender = Convert.ToChar(Gender);
float studentGPA = Convert.ToInt64(GPA);
if (FileUpload2.HasFile)
{
byte[] ImageByteArray = null;
ImageByteArray = ConvertImageToByteArray(FileUpload2);
try
{
if (DAC.UpdateStudent( FirstName, LastName, studentGender, studentGPA, ImageByteArray))
{
StatusLabel.Text = "Student" + StudentID + "Has been Updated Successfully.";
StudentGridView.EditIndex = -1;
DisplayStudentInformation();
}
}
catch (SqlException ex)
{
StatusLabel.Text = ex.Message;
}
}
}
protected void StudentGridView_RowDeleting(object sender, GridViewDeleteEventArgs e)
{ //Index was out of range. Must be non-negative and less than the size of the collection.
//Parameter name: index
string StudentID = ((Label)StudentGridView.Rows[e.RowIndex].Cells[0].FindControl("txtStudentID")).Text;
try
{
if (DAC.DeleteStudent(StudentID))
{
StatusLabel.Text = "Student" + StudentID + "Has been Delted. ";
DisplayStudentInformation();
}
else
{
StatusLabel.Text = "Student" + StudentID + "Could Not Be Delted.";
}
}
catch (SqlException ex)
{
StatusLabel.Text = ex.Message;
}
}
Мой .aspx код
asp:ScriptManager ID="asm" runat ="server">
/asp:ScriptManager>
asp:Label ID="StatusLabel" runat="server"></asp:Label>
div style="vertical-align: top; height:300px; width:100%; overflow:auto;">
asp:GridView ID="StudentGridView" runat ="server" Height="302px" Width="800px"
BackColor ="White" BorderColor ="#999999" GridLines ="Vertical"
BorderWidth="1px" CellPadding ="3"
AutoGenerateColumns ="false" style="margin-top: 0px"
EnableViewState ="false" OnRowEditing="studentGridview_RowEditing"
OnRowCancelingEdit="studentGridview_RowCancelEdit" OnRowUpdating="studentGridview_RowUpdating"
OnRowDeleting="StudentGridView_RowDeleting" >
Columns>
asp:TemplateField HeaderText="StudentID">
ItemTemplate>
asp:Label ID ="txtStudentID" runat ="server" Text='<%# Eval("StudentID") %>' />
/ItemTemplate>
/asp:TemplateField>
asp:TemplateField HeaderText ="FirstName">
ItemTemplate>
asp:TextBox ID="txtStudentFName" runat ="server" Text ='<%# Eval("FirstName") %>' ></asp:TextBox>
/ItemTemplate>
/asp:TemplateField>
asp:TemplateField HeaderText ="LastName">
ItemTemplate>
asp:TextBox ID="txtStudentLName" runat ="server" Text ='<%# Eval("LastName") %>' />
/ItemTemplate>
/asp:TemplateField>
asp:TemplateField HeaderText ="Gender">
ItemTemplate>
asp:TextBox ID="txtStudentGender" runat ="server" Text ='<%# Eval("Gender") %>' />
/ItemTemplate>
/asp:TemplateField>
asp:TemplateField HeaderText ="GPA">
ItemTemplate>
asp:TextBox ID="txtStudentGPA" runat ="server" Text ='<%# Eval("GPA") %>' />
/ItemTemplate>
/asp:TemplateField>
asp:TemplateField HeaderText ="Images">
ItemTemplate>
asp:Image ID ="Image" runat ="server" Height ='30px' Width ='30px' ImageUrl ='<%# "Handler.ashx?StudentID="+Eval("StudentID") %>' />
/ItemTemplate>
/asp:TemplateField>
asp:CommandField ShowDeleteButton="true" CausesValidation ="false" />
asp:CommandField ShowEditButton="true" CausesValidation="false" />
/Columns>
HeaderStyle BackColor ="#0000B4" Font-Bold ="true" ForeColor ="White" Font-Size="Small" />
EditRowStyle BackColor ="#00ABC" Font-Bold="true" ForeColor="White" font-Size="Small" />
AlternatingRowStyle BackColor="#DCDCDC" Font-Size="Small" />
SelectedRowStyle BackColor ="#00ABAC" Font-Bold="true" ForeColor ="White" Font-Size="Small" />
/asp:GridView>
/div>
asp:Table runat="server" Height="16px" Width="78px">
asp:TableRow>
asp:TableCell ><asp:Image ID ="AddStudentRecord" runat ="server" Width="100" Height ="50" ImageUrl="~/images/AddStudentRecord.JPG"/></asp:TableCell>
/asp:TableRow>
asp:TableRow>
asp:TableCell>
asp:Panel CssClass="modal" ID ="ModalPanel" ScrollBars="Vertical" runat ="server" Width="950" Height="90" style="display:none">
asp:Table runat ="server">
asp:TableRow>
asp:TableCell>
asp:Label ID="StudentIDLabel" runat ="server" Text="Student ID">/asp:Label>
/asp:TableCell>
asp:TableCell>
asp:Label ID="StudentFirstNameLabel" runat ="server" Text="Student FirstName"></asp:Label>
/asp:TableCell>
asp:TableCell>
asp:Label ID="StudentLastNameLabel" runat ="server" Text="Student LastName"></asp:Label>
/asp:TableCell>
asp:TableCell>
asp:Label ID="StudentGenderLabel" runat ="server" Text="Student Gender"></asp:Label>
/asp:TableCell>
asp:TableCell>
asp:Label ID="StudentGPALabel" runat ="server" Text="Student GPA">/asp:Label>
/asp:TableCell>
asp:TableCell>
asp:Label ID="StudentImageLabel" runat ="server" Text="Student Image"></asp:Label>
/asp:TableCell>
/asp:TableRow>
asp:TableRow>
asp:TableCell>
asp:TextBox ID="StudentIDTextBox" runat ="server"></asp:TextBox>
/asp:TableCell>
asp:TableCell>
asp:TextBox ID="StudentFirstNameTextBox" runat ="server">/asp:TextBox>
/asp:TableCell>
asp:TableCell>
asp:TextBox ID="StudentLastNameTextBox" runat ="server">/asp:TextBox>
/asp:TableCell>
asp:TableCell>
asp:TextBox ID="StudentGenderTextBox" runat ="server">/asp:TextBox>
/asp:TableCell>
asp:TableCell>
asp:TextBox ID="StudentGPATextBox" runat ="server">/asp:TextBox>
/asp:TableCell>
asp:TableCell>
asp:Image ID="StudentImage" ImageUrl="" Width="25px" Height ="25px" runat="server" />
/asp:TableCell>
/asp:TableRow>
asp:TableRow>
asp:TableCell ColumnSpan ="4" HorizontalAlign="Center">
asp:Button ID="OKButton" runat ="server" Text="Add" />
asp:Button ID="CancelButton" runat ="server" Text ="Cancel" />
/asp:TableCell>
asp:TableCell >
/asp:TableCell>
asp:TableCell HorizontalAlign="left">
asp:FileUpload ID="FileUpload2" runat="server" />
asp:Button ID="Button1" runat="server" Text="Upload" OnClick="UploadButton_Click" />
/asp:TableCell>
/asp:TableRow>
/asp:Table>
/asp:Panel>
cc1:ModalPopupExtender ID="ModalPopupExtender1" runat="server"
TargetControlID="AddStudentRecord" PopupControlID="ModalPanel" BackgroundCssClass ="modalBackground" />
Пожалуйста, скажите мне, кто должен решить эту ошибку, а также рассмотрите мою логику обновления изображений. Я не уверен, что моя логика правильная или неправильная.