我面临一个有关DataGridView行隐藏在我的项目中的问题.
我粘贴的代码可以在单独的测试项目中使用,但不能在我的项目中使用.请帮我.
我正在测试的代码
public partial class frmTestGirdBinding : Form
{
CustomDataCollection cdata = new CustomDataCollection();
Random rnd = new Random();
public frmTestGirdBinding()
{
InitializeComponent();
}
private void frmTestGirdBinding_Load(object sender, EventArgs e)
{
BindingSource bindingSource1 = new BindingSource();
bindingSource1.DataSource = cdata;
dataGridView1.DataSource = bindingSource1;
//bindingSource1.Filter = "Srno = 3"; not working
CurrencyManager cm = (CurrencyManager)BindingContext[bindingSource1.DataSource];
cm.SuspendBinding();
//InVisible the rows
dataGridView1.Rows[2].Visible = false;
dataGridView1.Rows[3].Visible = false;
cm.ResumeBinding();
}
private void button1_Click(object sender, EventArgs e)
{
for (int i = 0; i < cdata.Count; i++)
{
cdata[i].Reading = (float)rnd.NextDouble();
}
dataGridView1.Refresh(); //without this all rows are not updating
}
}
class CustomDataCollection : BindingList<CustomData>
{
public CustomDataCollection()
{
this.Add(new CustomData() { SrNo = 1, Name = "A", Reading = 11.11F });
this.Add(new CustomData() { SrNo = 2, Name = "B", Reading = 22.11F });
this.Add(new CustomData() { SrNo = 3, Name = "C", Reading = 33.11F });
this.Add(new CustomData() { SrNo = 4, Name = "D", Reading = 44.11F });
this.Add(new CustomData() { SrNo = 5, Name = "E", Reading = 55.11F });
this.Add(new CustomData() { SrNo = 6, Name = "F", Reading = 66.11F });
this.Add(new CustomData() { SrNo = 7, Name = "G", Reading = 77.11F });
}
}
class CustomData : INotifyPropertyChanged
{
int srno;
public int SrNo
{
get { return srno; }
set { srno = value; OnPropertyChanged("SrNo"); }
}
string name;
public string Name
{
get { return name; }
set { name = value; OnPropertyChanged("Name"); }
}
float reading;
public float Reading
{
get { return reading; }
set { reading = value; OnPropertyChanged("Reading"); }
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged(string propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
#endregion
}
解决方法:
搜索此问题可以通过添加DataBindingComplete事件并隐藏特定行来解决该问题. DataBindingComplete被触发2次,绑定时触发1次,form_load事件完成后触发2次.
public partial class frmTestGirdBinding : Form
{
CustomDataCollection cdata = new CustomDataCollection();
Random rnd = new Random();
public frmTestGirdBinding()
{
InitializeComponent();
this.dataGridView1.DataBindingComplete += new System.Windows.Forms.DataGridViewBindingCompleteEventHandler(this.dataGridView1_DataBindingComplete);
}
private void frmTestGirdBinding_Load(object sender, EventArgs e)
{
BindingSource bindingSource1 = new BindingSource();
bindingSource1.DataSource = cdata;
dataGridView1.DataSource = bindingSource1;
}
private void button1_Click(object sender, EventArgs e)
{
for (int i = 0; i < cdata.Count; i++)
{
cdata[i].Reading = (float)rnd.NextDouble();
}
dataGridView1.Refresh(); //without this all rows are not updating
}
private void dataGridView1_DataBindingComplete(object sender, DataGridViewBindingCompleteEventArgs e)
{
//InVisible the rows
dataGridView1.Rows[2].Visible = false;
dataGridView1.Rows[3].Visible = false;
}
}
class CustomDataCollection : BindingList<CustomData>
{
public CustomDataCollection()
{
this.Add(new CustomData() { SrNo = 1, Name = "A", Reading = 11.11F });
this.Add(new CustomData() { SrNo = 2, Name = "B", Reading = 22.11F });
this.Add(new CustomData() { SrNo = 3, Name = "C", Reading = 33.11F });
this.Add(new CustomData() { SrNo = 4, Name = "D", Reading = 44.11F });
this.Add(new CustomData() { SrNo = 5, Name = "E", Reading = 55.11F });
this.Add(new CustomData() { SrNo = 6, Name = "F", Reading = 66.11F });
this.Add(new CustomData() { SrNo = 7, Name = "G", Reading = 77.11F });
}
}
class CustomData : INotifyPropertyChanged
{
int srno;
public int SrNo
{
get { return srno; }
set { srno = value; OnPropertyChanged("SrNo"); }
}
string name;
public string Name
{
get { return name; }
set { name = value; OnPropertyChanged("Name"); }
}
float reading;
public float Reading
{
get { return reading; }
set { reading = value; OnPropertyChanged("Reading"); }
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged(string propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
#endregion
}