当我单击选择按钮时，我的图像未加载到Fileupload字段 [英] When I Click On The Select Button My Image Isn't Loaded To The Fileupload Field
本文介绍了当我单击选择按钮时，我的图像未加载到Fileupload字段的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
当我点击选择按钮时，所有其他字段都填充了除文件上传按钮之外的数据
使用系统;
使用 System.Collections.Generic;
使用 System.Linq;
使用 System.Web;
使用 System.Web.UI;
使用 System.Web.UI.WebControls;
使用 System.Web.UI.WebControls.Expressions;
使用 System.Data;
使用 System.Data.OleDb;
使用 System.Configuration;
使用 System.Collections;
使用 System.IO;
使用 LMCSS.P;
命名空间 Langkuk_Memorial_Sech.School.pages.setup
{
public partial class istudent：System.Web.UI.Page
{
受保护 void Page_Load（ object sender，EventArgs e）
{
GridView1.AutoGenerateSelectButton = true ;
GridView1.AutoGenerateDeleteButton = false ;
GridView1.PageSize = 4 ;
showdata（）;
}
public void showdata（）
{
string cs = ConfigurationManager.ConnectionStrings [ CONNSTRING]的ConnectionString。
OleDbConnection conn = new OleDbConnection（cs）;
conn.Open（）;
OleDbDataAdapter adap = new OleDbDataAdapter（ stuSelectAll ，conn）;
adap.SelectCommand.CommandType = CommandType.StoredProcedure;
DataSet ds = new DataSet（）;
adap.Fill（ds）;
GridView1.DataSource = ds.Tables [ 0 ];
GridView1.DataBind（）;
conn.Close（）;
}
public void btnReset_Click（ object sender，ImageClickEventArgs e）
{
// set
txtRegno.Text = ;
txtSurname.Text = ;
txtOthernames.Text = ;
txtDOB.Text = ;
txtPhoneno.Text = ;
txtContactaddress.Text = ;
txtEmail.Text = ;
mbox1.Visible = false ;
}
受保护 void btnSave_Click（ object sender，ImageClickEventArgs e）
{
// 获取imagelength
int imagelength = FileUpload1.PostedFile.ContentLength;
// 获取imagebyte
byte [] imagebyte = new byte [imagelength];
// 获取输入流
FileUpload1.PostedFile.InputStream.Read（ imagebyte， 0 ，imagelength）;
string cs = ConfigurationManager.ConnectionStrings [ CONNSTRING]的ConnectionString。
OleDbConnection conn = new OleDbConnection（cs）;
conn.Open（）;
OleDbCommand cmd = new OleDbCommand（ stuInsert ，conn）;
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue（ @ regno，txtRegno.Text）;
cmd.Parameters.AddWithValue（ @ surname，txtSurname.Text）;
cmd.Parameters.AddWithValue（ @ othernames，txtOthernames.Text）;
cmd.Parameters.AddWithValue（ @ dob，txtDOB.Text）;
cmd.Parameters.AddWithValue（ @ genderid，ddlGender.SelectedValue）;
cmd.Parameters.AddWithValue（ @ religionid，ddlReligion.SelectedValue）;
cmd.Parameters.AddWithValue（ @ nationalityid，ddlNationlity.SelectedValue）;
cmd.Parameters.AddWithValue（ @ stateid，ddlState.SelectedValue）;
cmd.Parameters.AddWithValue（ @ lgaid，ddlLga.SelectedValue）;
cmd.Parameters.AddWithValue（ @ phonenumber，txtPhoneno.Text）;
cmd.Parameters.AddWithValue（ @ contactaddress，txtContactaddress.Text）;
cmd.Parameters.AddWithValue（ @ email，txtEmail.Text）;
cmd.Parameters.AddWithValue（ @ classid，ddlClass.SelectedValue）;
cmd.Parameters.AddWithValue（ @ picture，imagebyte）;
int result = cmd.ExecuteNonQuery（）;
if （结果> 0）
{
btnReset_Click（sender，e）;
mbox1.showmsg（ 1 ， 学生已成功保存）;
}
else
{
bnnReset_Click（sender，e）;
mbox1.showmsg（ 3 ， 学生未成功保存）;
}
conn.Close（）;
showdata（）;
}
protected void GridView1_PageIndexChanging（ object sender，GridViewPageEventArgs e）
{
GridView1.PageIndex = e.NewPageIndex;
showdata（）;
}
protected void GridView1_SelectedIndexChanged（ object sender，EventArgs e）
{
}
protected void GridView1_SelectedIndexChanged1（ object sender，EventArgs e）
{
// //获取imagelength
// < span class =code-comment> int imagelength = FileUpload1.PostedFile.ContentLength;
// //获取imagebyte
// byte [] imagebyte = new byte [imagelength];
// //获取输入流
// < span class =code-comment> FileUpload1.PostedFile.InputStream.Read（imagebyte，0，imagelength）;
// string cs = ConfigurationManager.ConnectionStrings [connstring]。ConnectionString;
// OleDbConnection conn = new OleDbConnection（cs）;
// string query =从学生中选择图片，其中id =+ txtID.Text;
// OleDbCommand cmd = new OleDbCommand（query，conn）;
// conn.Open（）;
// OleDbDataReader reader = cmd.ExecuteReader（）;
// reader.Read（）;
// byte [] bs =（byte []读者[图片];
txtID.Text = GridView1.SelectedRow.Cells [ 2 ]。文字;
txtRegno.Text = GridView1.SelectedRow.Cells [ 3 ]。文字;
txtSurname.Text = GridView1.SelectedRow.Cells [ 4 ]。文字;
txtOthernames.Text = GridView1.SelectedRow.Cells [ 5 ]。文字;
txtDOB.Text = GridView1.SelectedRow.Cells [ 6 ]。文字;
ddlGender.Text = GridView1.SelectedRow.Cells [ 7 ]。Text.ToString（）;
ddlReligion.Text = GridView1.SelectedRow.Cells [ 8 ]。Text.ToString（）;
ddlNationlity.Text = GridView1.SelectedRow.Cells [ 9 ]。Text.ToString（）;
ddlState.Text = GridView1.SelectedRow.Cells [ 10 ]。Text.ToString（）;
ddlLga.Text = GridView1.SelectedRow.Cells [ 11 ]。Text.ToString（）;
txtPhoneno.Text = GridView1.SelectedRow.Cells [ 12 ]。文字;
txtContactaddress.Text = GridView1.SelectedRow.Cells [ 13 ]。文字;
txtEmail.Text = GridView1.SelectedRow.Cells [ 14 ]。文字;
ddlClass.Text = GridView1.SelectedRow.Cells [ 15 ]。Text.ToString（）;
// FileUpload1.Visible = false;
// FileUpload1.FileBytes = GridView1.SelectedRow.Cells [16] .Text.ToString（）;
// FileUpload1.FileName.ToString（）= Convert.ToByte（（byte []）reader [Picture] .ToString（））;
// conn.Close（）;
}
protected void btnUPdate_Click（< span class =code-keyword> object sender，ImageClickEventArgs e）
{
// 获取imagelength
int imagelength = FileUpload1.PostedFile.ContentLengt H;
// 获取imagebyte
byte [] imagebyte = new byte [imagelength];
// 获取输入流
FileUpload1.PostedFile.InputStream.Read（ imagebyte， 0 ，imagelength）;
string cs = ConfigurationManager.ConnectionStrings [ CONNSTRING]的ConnectionString。
OleDbConnection conn = new OleDbConnection（cs）;
conn.Open（）;
OleDbCommand cmd = new OleDbCommand（ stuUpdate ，conn）;
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue（ @ id，txtID.Text.ToString（） ）;
cmd.Parameters.AddWithValue（ @ regno，txtRegno.Text）;
cmd.Parameters.AddWithValue（ @ surname，txtSurname.Text）;
cmd.Parameters.AddWithValue（ @ othernames，txtOthernames.Text）;
cmd.Parameters.AddWithValue（ @ dob，txtDOB.Text）;
cmd.Parameters.AddWithValue（ @ genderid，ddlGender.SelectedValue）;
cmd.Parameters.AddWithValue（ @ religionid，ddlReligion.SelectedValue）;
cmd.Parameters.AddWithValue（ @ nationalityid，ddlNationlity.SelectedValue）;
cmd.Parameters.AddWithValue（ @ stateid，ddlState.SelectedValue）;
cmd.Parameters.AddWithValue（ @ lgaid，ddlLga.SelectedValue）;
cmd.Parameters.AddWithValue（ @ phonenumber，txtPhoneno.Text）;
cmd.Parameters.AddWithValue（ @ contactaddress，txtContactaddress.Text）;
cmd.Parameters.AddWithValue（ @ email，txtEmail.Text）;
cmd.Parameters.AddWithValue（ @ classid，ddlClass.SelectedValue）;
cmd.Parameters.AddWithValue（ @ picture，imagebyte）;
int result = cmd.ExecuteNonQuery（）;
if （结果> 0 ）
{
btnReset_Click（sender，e）;
mbox1.showmsg（ 1 ， 学生成功更新）;
}
else
{
bnnReset_Click（sender，e）;
mbox1.showmsg（ 3 ， 学生未成功更新）;
}
conn.Close（）;
showdata（）;
}
protected void GridView1_RowDeleting（ object sender，GridViewDeleteEventArgs e）
{
}
protected void btnDelete_Click（ object sender，ImageClickEventArgs e）
{
// 获取imagelength
int imagelength = FileUpload1.PostedFile.ContentLength;
// 获取imagebyte
byte [] imagebyte = new byte [imagelength];
// 获取输入流
FileUpload1.PostedFile.InputStream.Read（ imagebyte， 0 ，imagelength）;
string cs = ConfigurationManager.ConnectionStrings [ CONNSTRING]的ConnectionString。
OleDbConnection conn = new OleDbConnection（cs）;
conn.Open（）;
OleDbCommand cmd = new OleDbCommand（ stuDelete ，conn）;
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue（ @ id，txtID.Text.ToString（） ）;
int result = Convert.ToInt32（cmd.ExecuteNonQuery（）。ToString（））;
if （结果> 0 ）
{
mbox1.showmsg（ 1 ， 学生成功删除）;
}
else
{
mbox1.showmsg（ 3 ， 学生未成功删除）;
}
conn.Close（）;
}
}
}
解决方案
替换为：
FileUpload1.PostedFile.InputStream.Read（imagebyte， 0 ，imagelength）;
with
FileUpload1.PostedFile.InputStream.Seek（ 0 ，SeekOrigin.Begin）;
FileUpload1.PostedFile.InputStream.Read（imagebyte， 0 ，imagelength）;
请注意
// 0表示偏移量缓冲区，而不是流的起始位置
读取（imagebyte， 0 ，imagelength）;
When i click on the select button all other fields are populated with data except the fileupload button
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.Expressions;
using System.Data;
using System.Data.OleDb;
using System.Configuration;
using System.Collections;
using System.IO;
using LMCSS.P;
namespace Langkuk_Memorial_Sech.School.pages.setup
{
public partial class istudent : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
GridView1.AutoGenerateSelectButton = true;
GridView1.AutoGenerateDeleteButton = false;
GridView1.PageSize = 4;
showdata();
}
public void showdata()
{
string cs = ConfigurationManager.ConnectionStrings["connstring"].ConnectionString;
OleDbConnection conn = new OleDbConnection(cs);
conn.Open();
OleDbDataAdapter adap = new OleDbDataAdapter("stuSelectAll", conn);
adap.SelectCommand.CommandType = CommandType.StoredProcedure;
DataSet ds = new DataSet();
adap.Fill(ds);
GridView1.DataSource = ds.Tables[0];
GridView1.DataBind();
conn.Close();
}
public void btnReset_Click(object sender, ImageClickEventArgs e)
{
//set
txtRegno.Text = "";
txtSurname.Text = "";
txtOthernames.Text = "";
txtDOB.Text = "";
txtPhoneno.Text = "";
txtContactaddress.Text = "";
txtEmail.Text = "";
mbox1.Visible = false;
}
protected void btnSave_Click(object sender, ImageClickEventArgs e)
{
//get the imagelength
int imagelength = FileUpload1.PostedFile.ContentLength;
//get the imagebyte
byte[] imagebyte = new byte[imagelength];
//get the input stream
FileUpload1.PostedFile.InputStream.Read(imagebyte, 0, imagelength);
string cs = ConfigurationManager.ConnectionStrings["connstring"].ConnectionString;
OleDbConnection conn = new OleDbConnection(cs);
conn.Open();
OleDbCommand cmd = new OleDbCommand("stuInsert", conn);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@regno", txtRegno.Text);
cmd.Parameters.AddWithValue("@surname", txtSurname.Text);
cmd.Parameters.AddWithValue("@othernames", txtOthernames.Text);
cmd.Parameters.AddWithValue("@dob", txtDOB.Text);
cmd.Parameters.AddWithValue("@genderid", ddlGender.SelectedValue);
cmd.Parameters.AddWithValue("@religionid", ddlReligion.SelectedValue);
cmd.Parameters.AddWithValue("@nationalityid", ddlNationlity.SelectedValue);
cmd.Parameters.AddWithValue("@stateid", ddlState.SelectedValue);
cmd.Parameters.AddWithValue("@lgaid", ddlLga.SelectedValue);
cmd.Parameters.AddWithValue("@phonenumber", txtPhoneno.Text);
cmd.Parameters.AddWithValue("@contactaddress", txtContactaddress.Text);
cmd.Parameters.AddWithValue("@email", txtEmail.Text);
cmd.Parameters.AddWithValue("@classid", ddlClass.SelectedValue);
cmd.Parameters.AddWithValue("@picture", imagebyte);
int result = cmd.ExecuteNonQuery();
if(result>0)
{
btnReset_Click(sender, e);
mbox1.showmsg(1, "student saved successfully");
}
else
{
btnReset_Click(sender, e);
mbox1.showmsg(3, "student not-saved successfully");
}
conn.Close();
showdata();
}
protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
GridView1.PageIndex = e.NewPageIndex;
showdata();
}
protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
{
}
protected void GridView1_SelectedIndexChanged1(object sender, EventArgs e)
{
// //get the imagelength
// int imagelength = FileUpload1.PostedFile.ContentLength;
// //get the imagebyte
// byte[] imagebyte = new byte[imagelength];
// //get the input stream
// FileUpload1.PostedFile.InputStream.Read(imagebyte, 0, imagelength);
// string cs = ConfigurationManager.ConnectionStrings["connstring"].ConnectionString;
// OleDbConnection conn = new OleDbConnection(cs);
// string query = "select Picture from student where id = " + txtID.Text;
// OleDbCommand cmd = new OleDbCommand(query,conn);
// conn.Open();
// OleDbDataReader reader = cmd.ExecuteReader();
// reader.Read();
// byte[] bs = (byte[])reader["Picture"];
txtID.Text = GridView1.SelectedRow.Cells[2].Text;
txtRegno.Text = GridView1.SelectedRow.Cells[3].Text;
txtSurname.Text = GridView1.SelectedRow.Cells[4].Text;
txtOthernames.Text = GridView1.SelectedRow.Cells[5].Text;
txtDOB.Text = GridView1.SelectedRow.Cells[6].Text;
ddlGender.Text = GridView1.SelectedRow.Cells[7].Text.ToString();
ddlReligion.Text = GridView1.SelectedRow.Cells[8].Text.ToString();
ddlNationlity.Text = GridView1.SelectedRow.Cells[9].Text.ToString();
ddlState.Text = GridView1.SelectedRow.Cells[10].Text.ToString();
ddlLga.Text = GridView1.SelectedRow.Cells[11].Text.ToString();
txtPhoneno.Text = GridView1.SelectedRow.Cells[12].Text;
txtContactaddress.Text = GridView1.SelectedRow.Cells[13].Text;
txtEmail.Text = GridView1.SelectedRow.Cells[14].Text;
ddlClass.Text = GridView1.SelectedRow.Cells[15].Text.ToString();
//FileUpload1.Visible = false;
// FileUpload1.FileBytes = GridView1.SelectedRow.Cells[16].Text.ToString();
//FileUpload1.FileName.ToString() = Convert.ToByte((byte[])reader["Picture"].ToString());
//conn.Close();
}
protected void btnUPdate_Click(object sender, ImageClickEventArgs e)
{
//get the imagelength
int imagelength = FileUpload1.PostedFile.ContentLength;
//get the imagebyte
byte[] imagebyte = new byte[imagelength];
//get the input stream
FileUpload1.PostedFile.InputStream.Read(imagebyte, 0, imagelength);
string cs = ConfigurationManager.ConnectionStrings["connstring"].ConnectionString;
OleDbConnection conn = new OleDbConnection(cs);
conn.Open();
OleDbCommand cmd = new OleDbCommand("stuUpdate", conn);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@id", txtID.Text.ToString());
cmd.Parameters.AddWithValue("@regno", txtRegno.Text);
cmd.Parameters.AddWithValue("@surname", txtSurname.Text);
cmd.Parameters.AddWithValue("@othernames", txtOthernames.Text);
cmd.Parameters.AddWithValue("@dob", txtDOB.Text);
cmd.Parameters.AddWithValue("@genderid", ddlGender.SelectedValue);
cmd.Parameters.AddWithValue("@religionid", ddlReligion.SelectedValue);
cmd.Parameters.AddWithValue("@nationalityid", ddlNationlity.SelectedValue);
cmd.Parameters.AddWithValue("@stateid", ddlState.SelectedValue);
cmd.Parameters.AddWithValue("@lgaid", ddlLga.SelectedValue);
cmd.Parameters.AddWithValue("@phonenumber", txtPhoneno.Text);
cmd.Parameters.AddWithValue("@contactaddress", txtContactaddress.Text);
cmd.Parameters.AddWithValue("@email", txtEmail.Text);
cmd.Parameters.AddWithValue("@classid", ddlClass.SelectedValue);
cmd.Parameters.AddWithValue("@picture", imagebyte);
int result = cmd.ExecuteNonQuery();
if (result > 0)
{
btnReset_Click(sender, e);
mbox1.showmsg(1, "student updated successfully");
}
else
{
btnReset_Click(sender, e);
mbox1.showmsg(3, "student not-updated successfully");
}
conn.Close();
showdata();
}
protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
}
protected void btnDelete_Click(object sender, ImageClickEventArgs e)
{
//get the imagelength
int imagelength = FileUpload1.PostedFile.ContentLength;
//get the imagebyte
byte[] imagebyte = new byte[imagelength];
//get the input stream
FileUpload1.PostedFile.InputStream.Read(imagebyte, 0, imagelength);
string cs = ConfigurationManager.ConnectionStrings["connstring"].ConnectionString;
OleDbConnection conn = new OleDbConnection(cs);
conn.Open();
OleDbCommand cmd = new OleDbCommand("stuDelete", conn);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@id", txtID.Text.ToString());
int result = Convert.ToInt32(cmd.ExecuteNonQuery().ToString());
if (result > 0)
{
mbox1.showmsg(1, "student deleted successfully");
}
else
{
mbox1.showmsg(3, "student not-deleted successfully");
}
conn.Close();
}
}
} 解决方案
Replace this:
FileUpload1.PostedFile.InputStream.Read(imagebyte, 0, imagelength);
with
FileUpload1.PostedFile.InputStream.Seek(0, SeekOrigin.Begin); FileUpload1.PostedFile.InputStream.Read(imagebyte, 0, imagelength);
note that
// the 0 is for the offset in the buffer, not the start position of the stream Read(imagebyte, 0, imagelength);
这篇关于当我单击选择按钮时，我的图像未加载到Fileupload字段的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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