隐藏DataGridView中的行，绑定在我的项目中不起作用 [英] Hide Row in DataGridView with Binding not working in my project

问题描述

我在项目中面临一个关于datagridview行隐藏的问题。我粘贴的代码在saperate测试项目中工作，但不在我的项目中。请帮帮我。



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;不工作 
 
 
 CurrencyManager cm =（CurrencyManager）BindingContext [bindingSource1.DataSource]; 
 cm.SuspendBinding（）; 
  //   InVisible行 
 dataGridView1.Rows [ 2 ]。可见=  false ; 
 dataGridView1.Rows [ 3 ]。可见=  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（）;  //  没有这一切所有行都没有更新 
} 
} 
 
  class  CustomDataCollection：BindingList< CustomData> 
 {
  public  CustomDataCollection（）
 {
  this  .Add（ new  CustomData（）{SrNo =  1 ，Name =   A，Reading =  11  .11F}）; 
 此 .Add（ new  CustomData（）{SrNo =  2 ，Name =   B，Reading =  22  .11F}）; 
 此 .Add（ new  CustomData（）{SrNo =  3 ，Name =   C，Reading =  33  .11F}）; 
 此 .Add（ new  CustomData（）{SrNo =  4 ，Name =   D，Reading =  44  .11F}）; 
 此 .Add（ new  CustomData（）{SrNo =  5 ，Name =   E，Reading =  55  .11F}）; 
 此 .Add（ new  CustomData（）{SrNo =  6 ，Name =   F，Reading =  66  .11F}）; 
 此 .Add（ new  CustomData（）{SrNo =  7 ，Name =   G，Reading =  77  .11F}）; 
} 
} 
 类 CustomData：INotifyPropertyChanged 
 {
  int  srno; 
 
  public   int  SrNo 
 {
  get  { return  srno; } 
  set  {srno =  value ; OnPropertyChanged（  SrNo）; } 
} 
 
  string  name; 
 
  public   string 名称
 {
  get  { return  name; } 
  set  {name =  value ; OnPropertyChanged（ 名称）; } 
} 
 
  float 阅读; 
 
  public   float 阅读
 {
  get  { return 阅读; } 
  set  {reading =  value ; OnPropertyChanged（ 读）; } 
} 
   #region INotifyPropertyChanged会员
  
  public   event  PropertyChangedEventHandler PropertyChanged; 
 
  private   void  OnPropertyChanged（ string  propertyName）
 {
 PropertyChangedEventHandler handler = PropertyChanged; 
 
  if （handler！=  null ）
 {
 handler（ this ， new  PropertyChangedEventArgs（propertyName））; 
} 
} 
   #endregion 
  
} 

请帮帮我。

解决方案

搜索此问题通过添加DataBindingComplete事件解决问题并隐藏特定的行。 DataBindingComplete被激活2次，在绑定时为1，在form_load事件完成后为第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（此 .dataGridView1_DataBindingComplete）; 
} 
 
  private   void  frmTestGirdBinding_Load（ object  sender，EventArgs e）
 {
 BindingSource bindingSource1 =  new  BindingSource（）; 
 bindingSource1.DataSource = cdata; 
 dataGridView1.DataSource = bindingSource1; 
 
} 
 
  private   void  button1_Click（< span class =code-keyword> object  sender，EventArgs e）
 {
  for （ int  i =  0 ; i <  cdata.Count; i ++） 
 {
 cdata [i] .Reading =（ float ）rnd.NextDouble（）; 
} 
 dataGridView1.Refresh（）;  //  没有这一切所有行都没有更新 
} 
 
  private   void  dataGridView1_DataBindingComplete（ object  sender，DataGridViewBindingCompleteEventArgs e）
 {
  //   InVisible行 
 dataGridView1。行[ 2 ]。可见=  false ; 
 dataGridView1.Rows [ 3 ]。可见=  false ; 
} 
} 
 
  class  CustomDataCollection：BindingList< customdata> 
 {
  public  CustomDataCollection（）
 {
  this  .Add（ new  CustomData（）{SrNo =  1 ，Name =   A，Reading =  11  .11F}）; 
 此 .Add（ new  CustomData（）{SrNo =  2 ，Name =   B，Reading =  22  .11F}）; 
 此 .Add（ new  CustomData（）{SrNo =  3 ，Name =   C，Reading =  33  .11F}）; 
 此 .Add（ new  CustomData（）{SrNo =  4 ，Name =   D，Reading =  44  .11F}）; 
 此 .Add（ new  CustomData（）{SrNo =  5 ，Name =   E，Reading =  55  .11F}）; 
 此 .Add（ new  CustomData（）{SrNo =  6 ，Name =   F，Reading =  66  .11F}）; 
 此 .Add（ new  CustomData（）{SrNo =  7 ，Name =   G，Reading =  77  .11F}）; 
} 
} 
 类 CustomData：INotifyPropertyChanged 
 {
  int  srno; 
 
  public   int  SrNo 
 {
  get  { return  srno; } 
  set  {srno =  value ; OnPropertyChanged（  SrNo）; } 
} 
 
  string  name; 
 
  public   string 名称
 {
  get  { return  name; } 
  set  {name =  value ; OnPropertyChanged（ 名称）; } 
} 
 
  float 阅读; 
 
  public   float 阅读
 {
  get  { return 阅读; } 
  set  {reading =  value ; OnPropertyChanged（ 读）; } 
} 
   #region INotifyPropertyChanged会员
  
  public   event  PropertyChangedEventHandler PropertyChanged; 
 
  private   void  OnPropertyChanged（ string  propertyName）
 {
 PropertyChangedEventHandler handler = PropertyChanged; 
 
  if （handler！=  null ）
 {
 handler（ this ， new  PropertyChangedEventArgs（propertyName））; 
} 
} 
   #endregion 
  
} < /   customdata  >  

I'm facing one problem regarding datagridview row hiding in my project. The code I've pasted works in saperate test project but, not in my project. Please help me on this.

The code i'm testing

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

}

Please help me in this.

解决方案

Searching on this issue solve the problem by adding DataBindingComplete event and hide the specific row. DataBindingComplete is fired 2 times, 1 at the time of binding and 2nd after form_load event complete.

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

}</customdata>

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