3

プロジェクトで DataGridView 行が非表示になっているという問題に直面しています。貼り付けたコードは別のテスト プロジェクトでは機能しますが、私のプロジェクトでは機能しません。これについて私を助けてください。

私がテストしているコード

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

}
4

1 に答える 1

4

この問題を検索すると、 DataBindingCompleteイベントを追加して特定の行を非表示にすることで問題を解決できます。DataBindingComplete は 2 回発生します。1 回目はバインド時、2 回目は form_load イベントの完了後に発生します。

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

}
于 2013-11-14T09:54:34.283 に答える