关于DataGridView的一个问题

Question

本帖最后由 svview 于 2010-12-14 14:15:55 编辑

Answer 1

在CellContentClick中，遍历Column1，如果为选中状态，取得Column2中字符串，与当前选中的Column2中字符串比较，如果相同出提示
代码自己写一下吧，懒得写

Answer 2

javascript 可以控制這樣的操作....

Answer 3

........还没节帖啊........
写个参考,控件:dataGridView1private class CityModel
        {
            private string _CityName;
            public string CityName
            {
                get { return _CityName; }
                set { _CityName = value; }
            }
        }
        private void Form2_Load(object sender, EventArgs e)
        {
            List<CityModel> lst = new List<CityModel>();
            CityModel cm1 = new CityModel();
            cm1.CityName = "中国";
            CityModel cm2 = new CityModel();
            cm2.CityName = "美国";
            CityModel cm3 = new CityModel();
            cm3.CityName = "中国";
            lst.Add(cm1);
            lst.Add(cm2);
            lst.Add(cm3);
            dataGridView1.DataSource = lst;
        }
        int _isEdit = 0;
        private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            if (e.RowIndex > -1 && e.ColumnIndex == 0)
            {
                _isEdit = 1;
            }
        }        private void dataGridView1_CellEndEdit(object sender, DataGridViewCellEventArgs e)
        {
            _isEdit = 0;
        }        private void dataGridView1_RowValidating(object sender, DataGridViewCellCancelEventArgs e)
        {
            if (_isEdit == 0) return;
            if (dataGridView1.Rows[e.RowIndex].Cells[0].Value != null 
                && (bool)dataGridView1.Rows[e.RowIndex].Cells[0].Value == false) return;
            for (int i = 0; i < dataGridView1.Rows.Count; i++)
            {
                if (e.RowIndex != i && 
                    dataGridView1.Rows[i].Cells[1].Value.ToString() == dataGridView1.Rows[e.RowIndex].Cells[1].Value.ToString())
                {
                    if (dataGridView1.Rows[e.RowIndex].Cells[0].Value != null && (bool)dataGridView1.Rows[e.RowIndex].Cells[0].Value == true)
                    {
                        MessageBox.Show("已选择");
                        _isEdit = 0;
                        return;
                    }
                }
            }
        }

Answer 4

public class Class1 : INotifyPropertyChanged
{
        public event MyEventHandler Checked;
        public event PropertyChangedEventHandler PropertyChanged;        private bool column1;
        public bool Column1
        {
            get { return column1; }
            set
            {
                column1 = value;                if (PropertyChanged != null)
                    PropertyChanged(this, new PropertyChangedEventArgs("Column1"));                if(value == true) // 无论是通过界面还是代码，只要是true就触发这个事件。
                {
                    if (Checked != null)
                        Checked(this, new MyEventArgs { Col2 = Column2 });
                }
            }
        }        private string column2;
        public string Column2
        {
            get { return column2; }
            set
            {
                column2 = value;
                if (PropertyChanged != null)
                    PropertyChanged(this, new PropertyChangedEventArgs("Column2"));            }
        }        
    }    public delegate void MyEventHandler(object sender, MyEventArgs e);    public class MyEventArgs : EventArgs
    { 
        public string Col2 { get; set; }
    }
}  public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }        private void Form1_Load(object sender, EventArgs e)
        {
            Init();
        }        private List<Class1> list;        public void Init()
        {
            list = new List<Class1>();            Class1 cls = new Class1 { Column1 = false, Column2 = "中国人" };
            cls.Checked += new MyEventHandler(cls_Checked);
            list.Add(cls);            cls = new Class1 { Column1 = false, Column2 = "日本人" };
            cls.Checked += new MyEventHandler(cls_Checked);
            list.Add(cls);            cls = new Class1 { Column1 = false, Column2 = "中国人" };
            cls.Checked += new MyEventHandler(cls_Checked);
            list.Add(cls);            cls = new Class1 { Column1 = false, Column2 = "美国人" };
            cls.Checked += new MyEventHandler(cls_Checked);
            list.Add(cls);            cls = new Class1 { Column1 = false, Column2 = "日本人" };
            cls.Checked += new MyEventHandler(cls_Checked);
            list.Add(cls);            dataGridView1.DataSource = list;        }        void cls_Checked(object sender, MyEventArgs e)
        {            if (list.FindAll(p => p.Column1 == true && p.Column2 == e.Col2).Count > 1)
            {
                MessageBox.Show("不行，有重复");
                Class1 cls = sender as Class1;
                cls.Column1 = false;
            }
        }    }
这样做的好处是，你修改那些文字部分，比如日本人改成中国人或美国人，照样起着防止重得的作用。

Answer 5

 private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            
            if ((e.RowIndex > -1) && (e.ColumnIndex > -1))
            {
                if (this.dataGridView1.CurrentCell is DataGridViewCheckBoxCell)
                {
                    try
                    {
                        if ((bool)(this.dataGridView1.CurrentCell.Value) == true)//取消选中时返回
                            return;
                    }
                    catch { }                    try
                    {
                        if (IsChecked(this.dataGridView1.CurrentRow.Cells[1].Value.ToString()))
                        {
                            MessageBox.Show("你已经选择了");
                        }
                    }
                    catch { }
                }
            }        }        //已经选中过
        bool IsChecked(string value)
        {
            foreach (DataGridViewRow dr in this.dataGridView1.Rows)
            {
                try
                {
                    if ((bool)(dr.Cells[0].Value) == true)
                    {
                        if (dr.Cells[1].Value.ToString() == value)
                            return true;
                    }
                }
                catch { return false; }
            }
            return false;
        }

Answer 6

如果DataGrid绑定的是DataTable之类会更方便,直接datatable.Select("字段1=true,字段2='中国人'").Count>0类似的代码就可以判断出已经有复选择了

Answer 7

看着不好,重发一下: private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            
            if ((e.RowIndex > -1) && (e.ColumnIndex > -1))
            {
                if (this.dataGridView1.CurrentCell is DataGridViewCheckBoxCell)
                {
                    try
                    {
                        if ((bool)(this.dataGridView1.CurrentCell.Value) == true)//取消选中时返回
                            return;
                    }
                    catch { }                    try
                    {
                        if (IsChecked(this.dataGridView1.CurrentRow.Cells[1].Value.ToString()))
                        {
                            MessageBox.Show("你已经选择了");
                        }
                    }
                    catch { }
                }
            }        }        //已经选中过
        bool IsChecked(string value)
        {
            foreach (DataGridViewRow dr in this.dataGridView1.Rows)
            {
                try
                {
                    if ((bool)(dr.Cells[0].Value) == true)
                    {
                        if (dr.Cells[1].Value.ToString() == value)
                            return true;
                    }
                }
                catch { return false; }
            }
            return false;
        }

Answer 8

你真是我亲哥！ 哈哈我就想要这样的！我是和DataTable绑定了，可是不能用Select，因为这些属性都是能过别的画面用list传过来的·！

Answer 9

在每次checkBox打勾的时候用一个HashTable保存打勾的数据，key是行号，value是选择的值或者对应的ID，同样打勾去掉的时候就找到把值给删掉。这样打勾的时候直接从这个HashTable里面去查找有没有选中同样值的数据，不就可以判断了，而且循环次数也少。

Answer 10

谢谢你给我的回答，不过现在有个问题，你给我的代码是在点击后判断出提示框，之后这个重复的checkbox就被选上了，怎么能让它不选上呢？