我需要一些帮助，将表格中的数据显示在winform上。通常这可以使用datagridview来完成，但是根据我的理解，datagridvide要么显示表的全部内容，要么我可以使用过滤函数来显示与过滤器匹配的数据。
我目前面临的问题是，我有一个名为book_issued的表，其中包含发给学生的所有书籍的详细信息，每个学生都有一个独特的注册表。
我有一个登录表单，可以在登录时获取学生注册的值，然后将其指向另一个表格，该表格应该显示学生已经签发的所有书籍的列表。
要实现这一点，我正在运行sql查询
"SELECT * FROM book_issued WHERE regid = @regid"
我正在跳过传递参数化值并从datareader读取数据的过程。
我的问题是在表单上显示这些数据，非常感谢一些帮助
与问题无关的愚蠢代码，但ppl会在没有它的情况下对这个问题进行投票
private void student_Load(object sender, EventArgs e)
{
// TODO: This line of code loads data into the 'libDataSet8.issue' table. You can move, or remove it, as needed.
this.issueTableAdapter1.Fill(this.libDataSet8.issue);
// TODO: This line of code loads data into the 'libDataSet7.issue' table. You can move, or remove it, as needed.
//this.issueTableAdapter.Fill(this.libDataSet7.issue);
//// TODO: This line of code loads data into the 'libDataSet6.books' table. You can move, or remove it, as needed.
//this.booksTableAdapter.Fill(this.libDataSet6.books);
}
private void nameToolStripButton_Click(object sender, EventArgs e)
{
try
{
this.booksTableAdapter.name(this.libDataSet6.books, nameToolStripTextBox.Text);
}
catch (System.Exception ex)
{
System.Windows.Forms.MessageBox.Show(ex.Message);
}
}
//Get Student Details
private void student_details(string input)
{
query = "SELECT * FROM student WHERE regid = @regid";
string conString = Properties.Settings.Default.libConnectionString;
using (SqlCeConnection conn = new SqlCeConnection(conString))
{
conn.Open();
using (SqlCeCommand cmd = new SqlCeCommand(query, conn))
{
cmd.Parameters.AddWithValue("@regid", input);
cmd.ExecuteNonQuery();
SqlCeDataReader reader = cmd.ExecuteReader();
while (reader.Read())
{
dob = reader["dob"].ToString();
sbook = Convert.ToInt32(reader["book"].ToString());
fine = Convert.ToDouble(reader["fine"].ToString());
}
string temp = dob.Substring(5, 4);
int years = DateTime.Now.Year - Convert.ToInt32(temp);
sage = years;
}
}
}
//Method to validate user inputs
private bool ValidateISBNi()
{
bool bStatus = true;
if (isbni.Text == string.Empty)
{
errorProvider2.SetError(isbni, "");
errorProvider1.SetError(isbni, "Please Enter ISBN code");
bStatus = false;
}
else
{
query = "SELECT * FROM books WHERE isbn = @isbn";
string conString = Properties.Settings.Default.libConnectionString;
using (SqlCeConnection conn = new SqlCeConnection(conString))
{
conn.Open();
using (SqlCeCommand cmd = new SqlCeCommand(query, conn))
{
cmd.Parameters.AddWithValue("@isbn", isbni.Text);
cmd.ExecuteNonQuery();
SqlCeDataReader reader = cmd.ExecuteReader();
while (reader.Read())
{
counter = 1;
}
}
}
if (counter == 1)
{
errorProvider1.SetError(isbni, "");
errorProvider2.SetError(isbni, "Good");
counter = 0;
}
else
{
errorProvider2.SetError(isbni, "");
errorProvider1.SetError(isbni, "Invalid ISBN code");
bStatus = false;
}
}
return bStatus;
}
private bool ValidateISBNr()
{
bool bStatus = true;
if (isbni.Text == string.Empty)
{
errorProvider2.SetError(isbnr, "");
errorProvider1.SetError(isbnr, "Please Enter ISBN code");
bStatus = false;
}
else
{
query = "SELECT * FROM issue WHERE isbn = @isbn AND rgid = @rgid";
string conString = Properties.Settings.Default.libConnectionString;
using (SqlCeConnection conn = new SqlCeConnection(conString))
{
conn.Open();
using (SqlCeCommand cmd = new SqlCeCommand(query, conn))
{
cmd.Parameters.AddWithValue("@isbn", isbnr.Text);
cmd.Parameters.AddWithValue("@rgid", Variables.regid);
cmd.ExecuteNonQuery();
SqlCeDataReader reader = cmd.ExecuteReader();
while (reader.Read())
{
counter = 1;
}
}
}
if (counter == 1)
{
errorProvider1.SetError(isbnr, "");
errorProvider2.SetError(isbnr, "Good");
counter = 0;
}
else
{
errorProvider2.SetError(isbni, "");
errorProvider1.SetError(isbni, "Invalid ISBN code");
bStatus = false;
}
}
return bStatus;
}
private void isbni_Validating(object sender, CancelEventArgs e)
{
ValidateISBNi();
}
private void isbnr_Validating(object sender, CancelEventArgs e)
{
ValidateISBNr();
}
private void button1_Click(object sender, EventArgs e)
{
bool vissue;
vissue = ValidateISBNi();
if (vissue)
{
}
}
private void button3_Click(object sender, EventArgs e)
{
this.Close();
}
private void groupBox3_Enter(object sender, EventArgs e)
{
}
}
}
有一堆随机代码可以帮助ne1吗？我不认为这就是为什么我没有在第一时间发布它
答案 0 :(得分：1)
这是你的意思吗？
在表单1中，假设您有一个TextBox名称 txtRegStud ，那么form1中的值将传递给form2？你与继承有关。
在form1中，这可能是代码：form2 f = new frm2();
f.strRegStud = txtRegStud.Text;
f.Show();
this.Dispose();
然后在你的form2中，你需要声明公共字符串以便携带任何其他形式的值：
public string strRegStud;
private void frm2_Load(object sender, EventArgs e)
{
try
{
OleDbConnection Con = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=..\\dbname.mdb;");
OleDbCommand command = new OleDbCommand();
OleDbDataAdapter adapter = new OleDbDataAdapter();
DataTable dt = new DataTable();
Con.Open();
command.CommandText = String.Format("SELECT * FROM book_issued WHERE regid ='{0}'", strRegStud);;
command.Connection = Con;
adapter.SelectCommand = command;
adapter.Fill(dt);
Con.Close();
Con.Dispose();
datagridview1.DataSource = dt;
}
catch (Exception ex)
{
XtraMessageBox.Show(ex.Message);
}
}
这就是你在寻找什么？