[英]How to check already file upload or image in folder in c#
我已经使用asp.net和c＃创建了学生详细信息。
我最近在编辑详细信息时添加了图像字段，并编辑了一些未提交图像的字段（如有必要，则进行了编辑），然后提交。在警报中显示“请上传您的图像”。
所以我需要检查图像文件夹中的图像是否为空以及文件上传中是否为空。
这是我的代码：
后台代码：
protected void btnsub_Click(object sender, EventArgs e)
{
SqlConnection con = Connection.DBconnection();
if (Textid.Text.Trim().Length > 0)
{
SqlCommand com = new SqlCommand("StoredProcedure3", con);
com.CommandType = CommandType.StoredProcedure;
com.Parameters.AddWithValue("@id", Textid.Text.Trim());
com.Parameters.AddWithValue("@Name", Textusername.Text.Trim());
com.Parameters.AddWithValue("@Class", Textclass.Text.Trim());
com.Parameters.AddWithValue("@Section", Textsection.Text.Trim());
com.Parameters.AddWithValue("@Address", Textaddress.Text.Trim());
try
{
string filename = string.Empty;
if (fileupload.PostedFile.FileName.Length > 0)
{
filename = Path.GetFileName(fileupload.PostedFile.FileName);
fileupload.SaveAs(Server.MapPath("~/Images/" + filename));
}
com.Parameters.AddWithValue("@Image",(filename.Length>0)? "Images/" + filename:string.Empty);
com.ExecuteNonQuery();
}
catch (Exception ex)
{
btnsub.Text = ex.Message;
}
Response.Redirect("studententry.aspx");
}
else
{
SqlCommand com = new SqlCommand("StoredProcedure1", con);
com.CommandType = CommandType.StoredProcedure;
com.Parameters.AddWithValue("@Name", Textusername.Text.Trim());
com.Parameters.AddWithValue("@Class", Textclass.Text.Trim());
com.Parameters.AddWithValue("@Section", Textsection.Text.Trim());
com.Parameters.AddWithValue("@Address", Textaddress.Text.Trim());
try
{
string filename = string.Empty;
if (fileupload.PostedFile.FileName.Length > 1)
{
filename = Path.GetFileName(fileupload.PostedFile.FileName);
fileupload.SaveAs(Server.MapPath("~/Images/" + filename));
}
com.Parameters.AddWithValue("@Image",(filename.Length>0)? "Images/" + filename:string.Empty);
com.ExecuteNonQuery();
}
catch (Exception ex)
{
btnsub.Text = ex.Message;
}
Response.Redirect("studententry.aspx");
}
}
protected void btnrst_Click(object sender, EventArgs e)
{
Textid.Text = string.Empty;
Textusername.Text = string.Empty;
Textclass.Text = string.Empty;
Textsection.Text = string.Empty;
Textaddress.Text = string.Empty;
}
protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
SqlConnection con = Connection.DBconnection();
if (e.CommandName == "EditRow")
{
GridViewRow gr = (GridViewRow)((Button)e.CommandSource).NamingContainer;
int index = gr.RowIndex;
hiddenfield.Value = index.ToString();
Textid.Text = gr.Cells[0].Text;
Textusername.Text = gr.Cells[1].Text;
Textclass.Text = gr.Cells[2].Text;
Textsection.Text = gr.Cells[3].Text;
Textaddress.Text = gr.Cells[4].Text;
Image1.ImageUrl = ((System.Web.UI.WebControls.Image)gr.Cells[5].Controls[0]).ImageUrl;
}
else if (e.CommandName == "Deleterow")
{
SqlCommand com = new SqlCommand("StoredProcedure4", con);
com.CommandType = CommandType.StoredProcedure;
com.Parameters.AddWithValue("@ID", Convert.ToInt32(e.CommandArgument));
var id = Int32.Parse(e.CommandArgument.ToString());
com.ExecuteNonQuery();
Response.Redirect("studententry.aspx");
}
}
protected void GridView1_SelectedIndexChanged(Object sender, EventArgs e)
{
int index = GridView1.SelectedIndex;
hiddenfield.Value = index.ToString();
}
aspx：
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
<center><div><h4>Student Registration</h4></div></center>
<div class="tblalign">
<table style="width: 100%;">
<tr>
<td><asp:HiddenField ID="hiddenfield" runat="server" />
<asp:TextBox ID="Textid" runat="server" Visible="false"></asp:TextBox>
</td>
</tr>
<tr>
<td>
<asp:Label ID="Label1" runat="server" Text="Name"></asp:Label>
</td>
<td>
</td>
<td>
<asp:TextBox ID="Textusername" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td>
<asp:Label ID="Label2" runat="server" Text="Class"></asp:Label>
</td>
<td>
</td>
<td>
<asp:TextBox ID="Textclass" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td>
<asp:Label ID="Label3" runat="server" Text="Section"></asp:Label>
</td>
<td>
</td>
<td>
<asp:TextBox ID="Textsection" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td>
<asp:Label ID="Label5" runat="server" Text="Address"></asp:Label>
</td>
<td>
</td>
<td>
<asp:TextBox ID="Textaddress" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td>
<asp:Label ID="Label4" runat="server" Text="Image"></asp:Label>
</td>
<td>
</td>
<td>
<asp:Image ID="Image1" runat="server" ControlStyle-Width="50" ControlStyle-Height = "50" />
</td>
<td>
<asp:FileUpload ID="fileupload" runat="server" />
</td>
</tr>
<tr>
<td>
<asp:Button ID="btnsub" runat="server" Text="Submit" OnClick="btnsub_Click" OnClientClick="return register();" />
<asp:Button ID="btnrst" runat="server" Text="Reset" OnClick="btnrst_Click" />
</td>
<td>
</td>
<td>
</td>
</tr>
</table></div>
<br />
<br />
<center><div><h4>Student Records</h4></div></center><br /> <br />
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
DataKeyNames="ID" DataSourceID="SqlDataSource1"
OnRowCommand="GridView1_RowCommand"
EnablePersistedSelection="True" BackColor="White"
OnSelectedIndexChanged="GridView1_SelectedIndexChanged">
<Columns>
<asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False"
ReadOnly="True" SortExpression="ID" />
<asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" />
<asp:BoundField DataField="Class" HeaderText="Class" SortExpression="Class" />
<asp:BoundField DataField="Section" HeaderText="Section"
SortExpression="Section" />
<asp:BoundField DataField="Address" HeaderText="Address"
SortExpression="Address" />
<asp:ImageField DataImageUrlField="Image" HeaderText="Image" ControlStyle-Width="50" ControlStyle-Height = "50">
</asp:ImageField>
<asp:TemplateField HeaderText="Edit">
<ItemTemplate>
<asp:Button runat="server" ID="btnedit" Text="Edit" CommandName="EditRow"></asp:Button>
</ItemTemplate>
<ControlStyle BorderColor="#CCFF66" />
</asp:TemplateField>
<asp:TemplateField HeaderText="Delete">
<ItemTemplate>
<asp:Button runat="server" ID="btndelete" Text="Delete" CommandArgument='<%# Eval("Id") %>' CommandName="Deleterow"></asp:Button>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<SelectedRowStyle BackColor="#FF66FF" />
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:ConnectionString %>"
SelectCommand="StoredProcedure2"
SelectCommandType="StoredProcedure">
<DeleteParameters>
<asp:Parameter Name="ID" />
<asp:Parameter Name="Name" />
<asp:Parameter Name="Class" />
<asp:Parameter Name="Section" />
<asp:Parameter Name="Image" />
</DeleteParameters>
<UpdateParameters>
<asp:Parameter Name="ID" />
<asp:Parameter Name="Name" />
<asp:Parameter Name="Class" />
<asp:Parameter Name="Section" />
<asp:Parameter Name="Image" />
</UpdateParameters>
</asp:SqlDataSource>
</asp:Content>
我认为在editrow命令中，我需要检查条件。 其实我是.net的新手。
任何人都可以帮助我解决此问题。
任何帮助将不胜感激。
谢谢，
要检查特定文件，请使用File.Exists(path) ，它将返回一个布尔值，指示路径中的文件是否存在。
System.IO.File.Exists(path)
由于您的代码是同步的，因此可以在将图像上传到文件夹后检查图像是否立即加载。 例如：
try
{
string filename = string.Empty;
if (fileupload.PostedFile.FileName.Length > 0)
{
filename = Path.GetFileName(fileupload.PostedFile.FileName);
fileupload.SaveAs(Server.MapPath("~/Images/" + filename));
}
string imgAddress = Path.GetFileName(fileupload.PostedFile.FileName);
//check whether your image is created:
bool isExist=System.IO.File.Exists(imgAddress);
com.Parameters.AddWithValue("@Image",(filename.Length>0)? "Images/" + filename:string.Empty);
com.ExecuteNonQuery();
}
catch (Exception ex)
{
btnsub.Text = ex.Message;
}
filename = Path.GetFileName(fileupload.PostedFile.FileName);
var fullPath="~/Images/" + filename;
if (System.IO.File.Exists(Server.MapPath(fullPath)))
{
// file exist
}
else
{
// file not exist
}
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