以下代码未通过 dataadapter.update() 将数据集的更改保存到数据库。我将 winform 上的数据显示到文本框。
我有一个保存按钮，用于保存对数据库所做的更改。更改仅保存到数据集的内存副本中。为了将更改保存到数据库，我缺少什么？
public partial class Frm_Main : Form
{
DataSet ds = new DataSet();
SqlDataAdapter adapter = new SqlDataAdapter();
BindingSource binding_Login = new BindingSource();
SqlCommandBuilder builder = new SqlCommandBuilder();
SqlConnection connection = new SqlConnection();
SqlCommand sqlcommand = new SqlCommand();
public Frm_Main()
{
InitializeComponent();
}
private void FrmMain_Load(object sender, EventArgs e)
{
this.Text = "Main (" + GlobalVars.username.ToString() + ")";
this.AcceptButton = btnSearch;
connection.ConnectionString = GlobalVars.sqlConnString;
}
private void FrmMain_Close(object sender, EventArgs e)
{
Close();
}
private void btnSearch_Click(object sender, EventArgs e)
{
if(!string.IsNullOrEmpty(txtSearch.Text))
{
Search();
}
}
public void Search()
{
string sqlcommandstring = "select * from login where loginname like @search;";
connection.Open();
sqlcommand.CommandText = sqlcommandstring;
sqlcommand.Connection = connection;
sqlcommand.Parameters.AddWithValue("@search", "%" + txtSearch.Text + "%");
adapter.SelectCommand = sqlcommand ;
builder.DataAdapter = adapter;
adapter.Fill(ds,"Login") ;
BindControls();
txtLoginName.DataBindings.Add(new Binding("Text", binding_Login, "LoginName"));
txtPassword.DataBindings.Add(new Binding("Text", binding_Login, "Password"));
adapter.UpdateCommand = builder.GetUpdateCommand();
adapter.DeleteCommand = builder.GetDeleteCommand();
adapter.InsertCommand = builder.GetInsertCommand();
}
private void btnNext_Click(object sender, EventArgs e)
{
binding_Login.MoveNext();
}
protected void BindControls()
{
binding_Login.DataSource = ds.Tables[0];
}
private void btnPrevious_Click(object sender, EventArgs e)
{
binding_Login.MovePrevious();
}
private void btnSave_Click(object sender, EventArgs e)
{
ds.AcceptChanges();
adapter.Update(ds.Tables[0]);
}
}
最佳答案
我能够通过将保存按钮点击事件更改为以下内容来解决问题:
private void btnSave_Click(object sender, EventArgs e)
{
this.binding_Login.EndEdit();
adapter.Update(this.ds.Tables[0]);
}
关于c# - dataadapter.update() 不保存到数据库，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/30158645/