我正在从openfiledialoge中选择文件并将其显示在图片框中,当我点击delete按钮时,它在文本框中显示我正在异常The process cannot access the file because it is being used by another process.
我搜索了很多这个例外以便得到解决,但是当我尝试关闭时,我没有解决任何问题带有imagename的文件,它位于文本框中,即我在图片框中显示的文件; 使用IsFileLocked方法,这会关闭并删除特定目录路径的所有文件,但是如何删除picturebox中显示的唯一文件,我哪里出错了
public partial class RemoveAds : Form
{
OpenFileDialog ofd = null;
string path = @"C:\Users\Monika\Documents\Visual Studio 2010\Projects\OnlineExam\OnlineExam\Image\"; // this is the path that you are checking.
public RemoveAds()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
if (System.IO.Directory.Exists(path))
{
ofd = new OpenFileDialog();
ofd.InitialDirectory = path;
DialogResult dr = new DialogResult();
if (ofd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
Image …这是我的Datagridview分页代码,为什么我Child list for field Questions cannot be created.在这行代码中没有使用这个ArgumentException this.dataGridView1.DataSource = GetCurrentRecords(1, con);.我哪里出错了
public partial class ShowEngClgList : Form
{
OleDbConnection con = null;
private OleDbCommand cmd1;
private OleDbCommand cmd2;
private OleDbDataAdapter adp1 = null;
DataSet ds;
private int PageSize = 10;
private int CurrentPageIndex = 1;
private int TotalPage = 0;
public ShowEngClgList()
{
InitializeComponent();
try
{
con = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=db1.mdb");
con.Open();
}
catch (Exception err)
{
}
cmd1 = new OleDbCommand("Select * from Questions order …当用户点击确认并查看按钮respactive(键,值)对被存储在哈希表中时,当用户点击查看按钮而不是特定列表项时元素颜色为红色,我想要的是if(key,value)对是否被添加如果用户点击确认按钮,使用评论按钮比我想改变它的值,简而言之这个(键,值)对我存储(问题,答案)所以如果用户不确定答案而不是他点击评论,并且后来他应该能够改变它的答案并标记为确认,所以这个列表项元素颜色变为绿色,我该怎么做
private void AddtoHashTabl(string key, string value)
{
if (hashtable.ContainsKey(key))
{
}
else
{
hashtable.Add(key, value);
}
}
private void Confirm_Click(object sender, EventArgs e)
{
string Q = "";
string A = "";
listView1.Items[Convert.ToInt16(listView1.SelectedItems[0].SubItems[0].Text) - 1].BackColor = Color.Green;
var q = Convert.ToInt16(listView1.SelectedItems[0].Text);
var selectedQuestion = questions[q - 1];
Q = selectedQuestion.Id;
if (radioButton12.Checked == true)
A = "1";
else if (radioButton11.Checked == true)
A = "2";
if (radioButton10.Checked == true)
A = "3";
if (radioButton9.Checked == true)
A = "4"; …我试图通过dataetimepicker's month and year value与存储在类型的数据库列中的日期进行比较来获取Id Date/Time,下面是我正在使用的查询,但它显示我在此行中出现以下错误while (rs.Read())
错误
No value given for one or more required parameters.
码
public int GetDrID_MonthWise(string DrName,int month,int year, int refDrID)
{
int data = 0;
try
{
string sql = "Select d.DoctorID From Doctor_Master d,Patient_registration p where d.LastName + ' ' + d.FirstName = '" + DrName + "' AND datepart(mm,p.[RegDate])=@month AND datepart(yyyy,p.[RegDate])=@year AND p.DoctorID=" + refDrID;
cmd = new OleDbCommand(sql, acccon);
cmd.Parameters.AddWithValue("@month", month);
cmd.Parameters.AddWithValue("@year", year);
rs = cmd.ExecuteReader();
while …我正在使用Paging来显示数据datagridview,但是当我尝试使用updatebutton数据更新任何数据时,应该更新在datagridview数据库中以及数据库中.
但我得到这个错误:
在传递带有已修改行的DataRow集合时,Update需要有效的UpdateCommand
发生在这一行:
adp1.Update(dt);//here I am getting error
下面是代码
public partial class EditMediClgList : Form
{
public EditMediClgList()
{
InitializeComponent();
try
{
con = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=db1.mdb");
con.Open();
}
catch (Exception err)
{
MessageBox.Show("Error:" +err);
}
cmd1 = new OleDbCommand("Select * from MedicalColeges order by MedicalClgID", con);
ds = new DataSet();
adp1 = new OleDbDataAdapter(cmd1);
adp1.Fill(ds, "MedicalColeges");
dataGridView1.DataSource = ds;
// Get total count of the pages;
this.CalculateTotalPages();
// Load the first page …The given path's format is not supported.在此行获取此错误
System.IO.Directory.CreateDirectory(visit_Path);
我在下面的代码中做错了
void Create_VisitDateFolder()
{
this.pid = Convert.ToInt32(db.GetPatientID(cmbPatientName.SelectedItem.ToString()));
String strpath = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location);
String path = strpath + "\\Patients\\Patient_" + pid + "\\";
string visitdate = db.GetPatient_visitDate(pid);
this.visitNo = db.GetPatientID_visitNo(pid);
string visit_Path = path +"visit_" + visitNo + "_" + visitdate+"\\";
bool IsVisitExist = System.IO.Directory.Exists(path);
bool IsVisitPath=System.IO.Directory.Exists(visit_Path);
if (!IsVisitExist)
{
System.IO.Directory.CreateDirectory(path);
}
if (!IsVisitPath)
{
System.IO.Directory.CreateDirectory(visit_Path);\\error here
}
}
得到这个值 visit_Path
C:\Users\Monika\Documents\Visual Studio 2010\Projects\SonoRepo\SonoRepo\bin\Debug\Patients\Patient_16\visit_4_16-10-2013 00:00:00\
我使用下面的代码来设置MdiParent表单的背景图像,它运行良好,但是当我点击最大化按钮时,BackgroundImage在右侧和底部边缘重复(即右侧和底侧图像部分重复),怎么做我避免这种情况并正确显示图像？
public Parent()
{
InitializeComponent();
foreach (Control ctl in this.Controls)
{
if (ctl is MdiClient)
{
ctl.BackgroundImage = Properties.Resources.bg;
ctl.BackgroundImageLayout = System.Windows.Forms.ImageLayout.Stretch;
break;
}
}
}
我正在获取数据并存储在数据表中以在 datatgridview 中显示它，如何使数据表的第二列visitdate成为link type？像这样的东西
DataGridViewLinkColumn linkcol = new DataGridViewLinkColumn();
this.dataGridViewVisits.Columns[1].DefaultCellStyle = linkcol;
下面是我在 datagridview 中显示数据的代码
cmd1 = new OleDbCommand("Select VisitNo,VisitDate,remark from Patient_Visit_Details WHERE Patient_ID=" + pid, con);
dt = new DataTable();
adp1 = new OleDbDataAdapter(cmd1);
adp1.Fill(dt);
this.dataGridViewVisits.DataSource = dt;
DataGridViewLinkColumn linkcol = new DataGridViewLinkColumn();
得到此错误An object reference is required for the non-static field, method, or property 'Microsoft.Win32.RegistryKey.SetValue(string, object)',我已从Registry中获取值并尝试使用下面的代码使用新值更新它们,但它显示我这个错误,我出错了？
private void button2_Click(object sender, EventArgs e)
{
txtEmailID.Enabled = true;
string eid = txtEmailID.Text;
RegistryKey key = Registry.ClassesRoot;
RegistryKey registryKey = Registry.CurrentUser.OpenSubKey(@"Software\StudentExam\Protection", true);
RegistryKey.SetValue("EmailID", eid);//Error at this Line
}