我有一个使用gridview的页面，其中声明了datasourceID，文件正确显示。但是，每当我更新gridview的照片时，gridview都无法正确更新，尽管我的文件夹中的照片已经从gridview检索到已经更新。我可以让他们检索正确的照片的唯一方法是，如果我实际上按F5或重新加载项目。 gridview也在更新面板内。
<asp:UpdateProgress ID="UpdateProgress1" AssociatedUpdatePanelID="UpdatePanel1" runat="server">
<ProgressTemplate>
<div class="overlay" align="center">
<div class="over">
<img alt="progress" src="images/loader.gif"/>
Processing... </div>
</div>
</ProgressTemplate>
</asp:UpdateProgress>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Always">
<ContentTemplate>
<div id="staffList">
<asp:SqlDataSource ID="SqlDataSource1" runat="server" EnableViewState="false" EnableCaching="false" ConnectionString="<%$ ConnectionStrings:Database1Entities %>"
SelectCommand="SELECT * FROM (SELECT Staff.[StaffID], Staff.[StaffName], Staff.[PhoneNo], Staff.[Photo], Staff.[EmpmType], Staff.[AcadStaff], Designation.[DesignationName], Section.[SectionName], Groups.[GroupName], Staff.[InternetAddr], ROW_NUMBER() OVER(ORDER BY Designation.[SortingOrder]) AS Rownum FROM Staff LEFT JOIN Designation ON Designation.[DesignationID] = Staff.[DesignationID] LEFT JOIN Groups ON Groups.[GroupID] = Staff.[GroupID] LEFT JOIN Section ON Section.[SectionID] = Staff.[SectionID] WHERE (Staff.[StaffName] IS NOT NULL)) AS test1 UNION ALL SELECT * FROM (SELECT Staff.[StaffID], Staff.[StaffName], Staff.[PhoneNo], Staff.[Photo], Staff.[EmpmType], Staff.[AcadStaff], Designation.[DesignationName], Section.[SectionName], Groups.[GroupName], Staff.[InternetAddr], ROW_NUMBER() OVER(ORDER BY Designation.[SortingOrder]) AS Rownum FROM Staff LEFT JOIN Designation ON Designation.[DesignationID] = Staff.[DesignationID] LEFT JOIN Groups ON Groups.[GroupID] = Staff.[GroupID] LEFT JOIN Section ON Section.[SectionID] = Staff.[SectionID] WHERE (Staff.[StaffName] IS NULL)) AS test2;"
DeleteCommand="DELETE FROM Staff Where StaffID=@DSid" DataSourceMode="DataSet" CacheKeyDependency="MyCacheDependency">
<DeleteParameters>
<asp:Parameter Name="DSid" Type="String" />
</DeleteParameters>
</asp:SqlDataSource>
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" CellPadding="4" HeaderStyle-HorizontalAlign="Left" DataKeyNames="StaffID" CssClass="table table-striped table-condensed" ForeColor="#333333" GridLines="None" DataSourceID="SqlDataSource1" OnSelectedIndexChanged="GridView1_SelectedIndexChanged" AllowPaging="True" PageSize="8" OnPageIndexChanging="GridView1_PageIndexChanging">
<AlternatingRowStyle BackColor="White" ForeColor="#284775" />
<Columns>
<asp:TemplateField ShowHeader="false">
<ItemTemplate>
<asp:Image ID="Image1" Height="50px" Width="40px" runat="server" ImageUrl='<%# Eval("Photo", "~/StaffPhoto/{0}") %>' />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="StaffID" HeaderText="Staff ID" ReadOnly="True" SortExpression="StaffID"/>
<asp:BoundField DataField="StaffName" HeaderText="Staff Name" SortExpression="StaffName"/>
<asp:BoundField DataField="PhoneNo" HeaderText="Ext. No" SortExpression="PhoneNo" />
<asp:BoundField DataField="DesignationName" HeaderText="Designation Name" SortExpression="DesignationName" />
<asp:BoundField DataField="InternetAddr" HeaderText="Email" SortExpression="InternetAddr" />
<%-- <asp:BoundField DataField="EmpmType" HeaderText="Employment Type" />
<asp:BoundField DataField="AcadStaff" HeaderText="Staff Type" />--%>
<asp:CommandField ShowSelectButton="True" />
<asp:TemplateField ShowHeader="False">
<ItemTemplate>
<asp:LinkButton ID="btndelete" runat="server" OnClick="btndelete_Click" Text="Delete" CommandName="Delete"
ForeColor="Black" />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField ShowHeader="False">
<ItemTemplate>
<asp:LinkButton runat="server" ID="btnUp" OnClick="Update_Click" ForeColor="Black">Update</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<EditRowStyle BackColor="#999999" />
<HeaderStyle BackColor="white" Font-Bold="false" ForeColor="black" />
<PagerStyle HorizontalAlign="Center" CssClass="pagination-ys" />
<RowStyle BackColor="white" ForeColor="#333333" />
<FooterStyle BackColor="white" ForeColor="black" />
<SelectedRowStyle BackColor="#E2DED6" ForeColor="#333333" />
<SortedAscendingCellStyle BackColor="#E9E7E2" />
<SortedAscendingHeaderStyle BackColor="#506C8C" />
<SortedDescendingCellStyle BackColor="#FFFDF8" />
<SortedDescendingHeaderStyle BackColor="#6F8DAE" />
<EmptyDataTemplate>
<span style="color: red">* No Data Found.</span>
</EmptyDataTemplate>
</asp:GridView>
</div>
<div style="clear: both; height: 50px;">
</div>
</ContentTemplate>
</asp:UpdatePanel>
页面加载绑定的代码
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
GridView1.SelectedIndex = -1;
GridView1.AllowPaging = false;
}
GridView1.DataBind();
GridView1.AllowPaging = true;
}
选择行
protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
{
string subgpID = GridView1.SelectedRow.Cells[1].Text;
BllStaff bs = new BllStaff();
string sName = bs.GetStaffName(subgpID);
if (sName == "")
{
ScriptManager.RegisterStartupScript(this, GetType(), "alert", "StaffErrorMessage();", true);
}
else
{
Response.Redirect("StaffListDetails.aspx?staffid=" + subgpID);
}
}
StaffUpdate Page CS
public partial class StaffUpdate : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (string.IsNullOrEmpty(Session["UT"] as string))
{
Response.Redirect("~/LoginPage.aspx");
}
lbMessage.Text = "";
string ID = Request.QueryString["staffid"].ToString();
lblSID.Text = ID;
tbStaffID.Text = ID;
if (Session["UT"].ToString() == "Admin")
{
ddlAT.Items.Remove("Admin");
}
if (ID == Session["StaffID"].ToString())
{
if (Session["UT"].ToString() == "Power Admin")
{
//Button1.Visible = true;
OPassword.Attributes.Remove("style");
NPassword.Attributes.Remove("style");
NCPassword.Attributes.Remove("style");
}
}
tbStaffID.ReadOnly = true;
if (!Page.IsPostBack)
{
if (Session["UT"].ToString() != "Power Admin")
{
if (Session["UT"].ToString() != "Admin")
{
ddlAT.Items.Insert(0, new ListItem("Staff", "Staff"));
ddlAT.Enabled = false;
}
else
{
if (ID == Session["StaffID"].ToString()) { ddlAT.Items.Insert(0, new ListItem("Admin", "Admin")); }
else
{
ddlAT.Items.Insert(0, new ListItem("Staff", "Staff"));
ddlAT.Enabled = false;
}
}
}
else
{
if (ID == Session["StaffID"].ToString())
{
ddlAT.Items.Insert(0, new ListItem("Power Admin", "Power Admin"));
ddlAT.Enabled = false;
}
else
{
BllAccount utAc = new BllAccount();
string utAccount = utAc.GetStaffUT(ID);
if (utAccount == "Admin")
{
ddlAT.Items.Insert(0, new ListItem("Admin", "Admin"));
ddlAT.Items.Insert(1, new ListItem("Staff", "Staff"));
}
else
{
ddlAT.Items.Insert(0, new ListItem("Staff", "Staff"));
ddlAT.Items.Insert(1, new ListItem("Admin", "Admin"));
}
}
}
}
}
private string Encrypt(string clearText)
{
string EncryptionKey = "MAKV2SPBNI99212";
byte[] clearBytes = Encoding.Unicode.GetBytes(clearText);
using (Aes encryptor = Aes.Create())
{
Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
encryptor.Key = pdb.GetBytes(32);
encryptor.IV = pdb.GetBytes(16);
using (MemoryStream ms = new MemoryStream())
{
using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateEncryptor(), CryptoStreamMode.Write))
{
cs.Write(clearBytes, 0, clearBytes.Length);
cs.Close();
}
clearText = Convert.ToBase64String(ms.ToArray());
}
}
return clearText;
}
protected void Button2_Click(object sender, EventArgs e)
{
string SID = tbStaffID.Text;
string oldP = Encrypt(tbPasswordOld.Text);
string newP = tbPasswordNewC.Text;
string ut = ddlAT.SelectedValue;
string fileName = "";
string OID = Request.QueryString["Staffid"].ToString();
if (tbStaffID.Text != "")
{
if (this.ImageFileUpload.HasFile)
{
if (tbPasswordNewC.Text != "" || tbPasswordOld.Text != "")
{ //update id, password, photo and UT
//if (RegularExpressionValidator2.IsValid)
if (tbPasswordNewC.Text != "" && tbPasswordOld.Text != "")
{
string strsql = "select * FROM Account WHERE UserID='" + SID + "' and Password='" + oldP + "'";
DataTable dt = sql.ExecTable(strsql);
if (dt.Rows.Count > 0)
{
try
{
string[] validFileTypes = { "bmp", "gif", "png", "jpg", "jpeg" };
string ext = System.IO.Path.GetExtension(ImageFileUpload.PostedFile.FileName).ToLower();
bool isValidFile = false;
for (int i = 0; i < validFileTypes.Length; i++)
{
if (ext == "." + validFileTypes[i])
{
isValidFile = true;
break;
}
}
if (!isValidFile)
{
lbMessage.ForeColor = System.Drawing.Color.Red;
lbMessage.Text = "* Invalid File. Please upload a File with extension " +
string.Join(", ", validFileTypes);
}
else
{
FileInfo fi = new FileInfo(ImageFileUpload.FileName);
string extion = fi.Extension;
Session["fileEx"] = extion;
fileName = "Ori" + SID + extion;
//create instance for image class
System.Drawing.Image myimg = default(System.Drawing.Image);
//get uploaded image input stream
using (myimg = System.Drawing.Image.FromStream(ImageFileUpload.PostedFile.InputStream))
{
//resize it using thumbnailimage method
int width = myimg.Width;
int height = myimg.Height;
double bthumbWidth = 300 * width / height;
int thumbWidth = Convert.ToInt32(bthumbWidth);
myimg = myimg.GetThumbnailImage(thumbWidth, 300, null, IntPtr.Zero);
MemoryStream str = new MemoryStream();
//Save it in the server images folder
myimg.Save(Server.MapPath("~\\StaffPhoto\\Ori\\" + fileName), myimg.RawFormat);
myimg.Dispose();
//string strFilePath = Server.MapPath("~/StaffPhoto/") + "\\" + fileName;
//this.ImageFileUpload.SaveAs(strFilePath);
imgUpload.ImageUrl = "~/StaffPhoto/Ori/" + fileName;
}
panCrop.Visible = true;
string up = "a";
Session["UpdateP"] = up;
}
}
catch (Exception ex)
{
lbMessage.ForeColor = System.Drawing.Color.Red;
lbMessage.Text = ex.Message + "* The Photo has failed to update. Please try again later!";
}
}
else
{
lbMessage.Text = "* Password Wrong!";
}
}
else
{
lbMessage.Text = "* Both password field must fill in!";
}
}
else //update photo, id and UT
{
try
{
string[] validFileTypes = { "bmp", "gif", "png", "jpg", "jpeg", "ico", "jpe" };
string ext = System.IO.Path.GetExtension(ImageFileUpload.PostedFile.FileName).ToLower();
bool isValidFile = false;
for (int i = 0; i < validFileTypes.Length; i++)
{
if (ext == "." + validFileTypes[i])
{
isValidFile = true;
break;
}
}
if (!isValidFile)
{
lbMessage.ForeColor = System.Drawing.Color.Red;
lbMessage.Text = "* Invalid File. Please upload a File with extension " +
string.Join(", ", validFileTypes);
}
else
{
FileInfo fi = new FileInfo(ImageFileUpload.FileName);
string extion = fi.Extension;
Session["fileEx"] = extion;
fileName = "Ori" + SID + extion;
//create instance for image class
System.Drawing.Image myimg = default(System.Drawing.Image);
//get uploaded image input stream
using (myimg = System.Drawing.Image.FromStream(ImageFileUpload.PostedFile.InputStream))
{
//resize it using thumbnailimage method
int width = myimg.Width;
int height = myimg.Height;
double bthumbWidth = 300 * width / height;
int thumbWidth = Convert.ToInt32(bthumbWidth);
myimg = myimg.GetThumbnailImage(thumbWidth, 300, null, IntPtr.Zero);
MemoryStream str = new MemoryStream();
//Save it in the server images folder
myimg.Save(Server.MapPath("~\\StaffPhoto\\Ori\\" + fileName), myimg.RawFormat);
myimg.Dispose();
//string strFilePath = Server.MapPath("~/StaffPhoto/") + "\\" + fileName;
//this.ImageFileUpload.SaveAs(strFilePath);
imgUpload.ImageUrl = "~/StaffPhoto/Ori/" + fileName;
}
panCrop.Visible = true;
string up = "b";
Session["UpdateP"] = up;
}
}
catch (Exception ex)
{
lbMessage.ForeColor = System.Drawing.Color.Red;
lbMessage.Text = ex.Message + "* The Photo has failed to update. Please try again later!";
}
}
}
else //update password, id and UT
{
if (tbPasswordNewC.Text != "" || tbPasswordOld.Text != "")
{ //update id, password, photo and UT
//if (RegularExpressionValidator2.IsValid)
if (tbPasswordNewC.Text != "" && tbPasswordOld.Text != "")
{
string strsql = "select * FROM Account WHERE UserID='" + SID + "' and Password='" + oldP + "'";
DataTable dt = sql.ExecTable(strsql);
if (dt.Rows.Count > 0)
{
string upMessage = "You are trying to update the information for staff: " + SID;
string no = "3";
Response.Redirect("AlertUpdate.aspx?MessageNO=" + no + "&UpdateMessage=" + upMessage + "&UpdateStaffid=" + SID + "&fileN=" + fileName + "&NewPass=" + newP + "&UserT=" + ut);
}
else
{
lbMessage.Text = "* Password Wrong!";
}
}
else
{
lbMessage.Text = "* Both password field must fill in!";
}
}
else
{
string upMessage = "You are trying to update the information for staff: " + SID;
string no = "4";
Response.Redirect("AlertUpdate.aspx?MessageNO=" + no + "&UpdateMessage=" + upMessage + "&UpdateStaffid=" + SID + "&fileN=" + fileName + "&NewPass=" + newP + "&UserT=" + ut);
}
}
}
else
{
lbMessage.Text = "* Staff ID must be provided";
}
}
private void CheckName()
{
string SID = tbStaffID.Text;
BllStaff bs = new BllStaff();
string sName = bs.GetStaffName(SID);
if (sName == "")
{
Response.Redirect("StaffListAdSearch.aspx");
}
else
{
Response.Redirect("StaffListDetails.aspx?staffid=" + SID);
}
}
protected void btnUpNewP_Click(object sender, EventArgs e)
{
uploadNewP.Visible = true;
uploadNewPD.Visible = false;
}
protected void Button1_Click(object sender, EventArgs e)
{
string staffid = tbStaffID.Text;
string role = ddlAT.SelectedValue;
Response.Redirect("AlertUSuc.aspx?staffid=" + staffid + "&role=" + role);
}
protected void btnCrop_Click(object sender, EventArgs e)
{
string SID = tbStaffID.Text;
string oldP = Encrypt(tbPasswordOld.Text);
string newP = tbPasswordNewC.Text;
string ut = ddlAT.SelectedValue;
string fileName = Path.GetFileName(imgUpload.ImageUrl);
string filePath = Path.Combine(Server.MapPath("~/StaffPhoto/Ori"), fileName);
string cropFileName = "";
string cropFilePath = "";
if (File.Exists(filePath))
{
System.Drawing.Image orgImg = System.Drawing.Image.FromFile(filePath);
System.Drawing.Rectangle CropArea = new System.Drawing.Rectangle(
Convert.ToInt32(X.Value),
Convert.ToInt32(Y.Value),
Convert.ToInt32(W.Value),
Convert.ToInt32(H.Value));
try
{
Bitmap bitMap = new Bitmap(CropArea.Width, CropArea.Height);
using (Graphics g = Graphics.FromImage(bitMap))
{
g.DrawImage(orgImg, new System.Drawing.Rectangle(0, 0, bitMap.Width, bitMap.Height), CropArea, GraphicsUnit.Pixel);
cropFileName = SID + Session["fileEx"];
cropFilePath = Path.Combine(Server.MapPath("~/StaffPhoto"), cropFileName);
bitMap.Save(cropFilePath);
bitMap.Dispose();
string At = ddlAT.SelectedValue;
if (Session["UpdateP"].ToString() == "a")
{
string upMessage = "You are trying to update the information for staff: " + SID;
string no = "1";
Response.Redirect("AlertUpdate.aspx?MessageNO=" + no + "&UpdateMessage=" + upMessage + "&UpdateStaffid=" + SID + "&fileN=" + cropFileName + "&NewPass=" + newP + "&UserT=" + ut + "&DelFile=" + fileName, false);
}
else if (Session["UpdateP"].ToString() == "b")
{
string upMessage = "You are trying to update the information for staff: " + SID;
string no = "2";
Response.Redirect("AlertUpdate.aspx?MessageNO=" + no + "&UpdateMessage=" + upMessage + "&UpdateStaffid=" + SID + "&fileN=" + cropFileName + "&NewPass=" + newP + "&UserT=" + ut + "&DelFile=" + fileName, false);
}
g.Dispose();
}
}
catch (Exception ex)
{
lbMessage.Text = ex.Message;
}
finally {
orgImg.Dispose();
}
}
}
}
AlertUpdate示例背后的代码
string strsql = "select UserType FROM Account WHERE UserID='" + OID + "'";
DataTable dt = sql.ExecTable(strsql);
if (dt.Rows.Count > 0)
{
uStaffA.UpdateAccountbaseOnStaffID(OID, OID, ut);
}
Updateaccountbaseonstaffid
public int UpdateAccountbaseOnStaffID(string staffid, string NStaffId, string ut)
{
StringBuilder sql;
SqlCommand sqlCmd;
int result = 0;
//int newOrderId = 0;
// create order header
SqlConnection conn = dbConn.GetConnection();
sql = new StringBuilder();
sql.AppendLine("UPDATE Account");
sql.AppendLine("SET UserID=@Nid, StaffID=@Nid, UserType=@UserType where StaffID=@Oid");
try
{
conn.Open();
sqlCmd = new SqlCommand(sql.ToString(), conn);
sqlCmd.Parameters.AddWithValue("@Oid", staffid);
sqlCmd.Parameters.AddWithValue("@Nid", NStaffId);
sqlCmd.Parameters.AddWithValue("@UserType", ut);
result = sqlCmd.ExecuteNonQuery();
}
catch (Exception ex)
{
errMsg = ex.Message;
}
finally
{
conn.Close();
}
return result;
}
AlertUpdateSuc
public partial class AlertUpdateSuc : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
if (Request.QueryString["MesNo"].ToString() == "1")
{
Session.Clear();
Response.Redirect("LoginPage.aspx");
}
else if (Request.QueryString["MesNo"].ToString() == "2")
{
Response.Redirect("StaffListAdSearch.aspx");
}
}
}
简而言之，即使照片更新正确，旧照片仍会显示，直到我刷新页面。
任何想法都会有所帮助！谢谢！
答案 0 :(得分：0)
如果更新图像，并不意味着您的gridview也必须更新。什么都不会被执行。你必须让命令被执行。更新图像后，您必须调用gridview的重新绑定。
答案 1 :(得分：0)
原来，为了正确重新绑定你的照片，你要做的就是更新图片网址。
但是，由于我们的图片网址永远不会更改，我所要做的就是在网址中添加一些数据，以便它变得唯一并正确更新。
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
Image img = e.Row.FindControl("Image1") as Image;
string url = img.ImageUrl;
string modified = url + "?time=" + DateTime.Now.ToString();
img.ImageUrl = modified;
}
}
通过执行上面的操作，GridView中的Image将会更新。 这也适用于DetailsView，只需这样做：
protected void ViewEmployeeDetails_DataBound(object sender, EventArgs e)
{
Image img = ViewEmployeeDetails.FindControl("Image1") as Image;
string url = img.ImageUrl;
string modified = url + "?time=" + DateTime.Now.ToString();
img.ImageUrl = modified;
}