帮助代表csharp [英] help delegate in csharp
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问题描述
我正在实现两种形式的功能。在form1中选择任何datagridviewcheckboxcolumn并在单击按钮关闭时显示form2，在form1 datagridviewcheckboxcolumn中将为false？
请帮忙。
命名空间WindowsFormsApplication1
{
公共部分类Form1：表格
{
Form2 Frm2 = new Form2（）;
public Form1（）
{
InitializeComponent（）;
DataGridViewCheckColumn（）;
Frm2.newEvent + = new FrmCheckbox（Frm2_Event）;
}
public void DataGridViewCheckColumn（）
{
dataGridView1.ColumnCount = 6;
dataGridView1.AllowUserToAddRows = false;
DataGridViewCheckBoxColumn colCB = new
DataGridViewCheckBoxColumn（）;
colCB.Name =chkcol;
colCB.HeaderText =选择;
colCB.Width = 40;
dataGridView1.Columns.Add（colCB）;
dataGridView1.Columns [0] .Name =C0;
dataGridView1.Columns [1] .Name =C1;
dataGridView1.Columns [2] .Name =C2;
dataGridView1.Columns [3] .Name =C3;
dataGridView1.Columns [4] .Name =C4;
dataGridView1.Columns [5] .Name =C5;
dataGridView1.Columns [0] .HeaderText =C0;
dataGridView1.Columns [1] .HeaderText =C1;
dataGridView1.Columns [2] .HeaderText =C2;
dataGridView1.Columns [3] .HeaderText =C3;
dataGridView1.Columns [4] .HeaderText =C4;
dataGridView1.Columns [5] .HeaderText =C5;
dataGridView1.Columns [0] .Width = 40;
dataGridView1.Columns [1] .Width = 40;
dataGridView1.Columns [2] .Width = 40;
dataGridView1.Columns [3] .Width = 40;
dataGridView1.Columns [4] .Width = 40;
dataGridView1.Columns [5] .Width = 40;
dataGridView1.Rows.Add（new string [] {A1，B1，C1，
D1，E1 ，F1}）;
dataGridView1.Rows.Add（new string [] {A2，B2，C2，
D2，E2，F2}）;
dataGridView1.Rows.Add（new string [] {A3，B3，C3，
D3，E3，F3}）;
dataGridView1.Rows.Add（new string [] {A4，B4，C4，
D4，E4，F4}）;
dataGridView1.Rows.Add（new string [] {A5，B5，C5，
D5，E5，F5}）;
dataGridView1.Rows.Add（new string [] {A6，B6，C6，
D6，E6，F6}）;
dataGridView1.Rows.Add（new string [] {A7，B7，C7，
D7，E7，F7}）;
dataGridView1.AutoResizeColumns（）;
}
void Frm2_Event（）
{
// for（int i = 0; i< = dataGridView1.Rows.Count - 1 ; i ++）
// {
// if（Convert.ToBoolean（dataGridView1.Rows [i] .Cells
[chkcol]。Value） == true）
// {
// dataGridView1.Rows [i] .Cells [chkcol]。Value = false;
//}
//}
foreach（DataGridViewRow中的dataGridView1.Rows行）
{
if（Convert.ToBoolean（row.Cells [ chkcol]。值）== true）
{
row.Cells [chkcol]。值= false;
}
}
}
private void dataGridView1_CellContentClick（object sender，
DataGridViewCellEventArgs e）
{
for（int i = 0; i< = dataGridView1.RowCount - 1; i ++）
{
if（Convert.ToBoolean（dataGridView1.Rows
[ e.RowIndex] .Cells [chkcol]。Value = true））
{
Frm2.ShowDialog（）;
休息;
}
}
}
}
}
使用System;
使用System.Collections.Generic;使用System.ComponentModel
;
使用System.Data;使用System.Drawing
;
使用System.Linq;
使用System.Text;
使用System.Windows.Forms;
命名空间WindowsFormsApplication1
{
public delegate void FrmCheckbox（）;
公共部分类Form2：表格
{
公共事件FrmCheckbox newEvent;
public Form2（）
{
InitializeComponent（）;
//button1.Click + = new EventHandler（button1_Click）;
}
private void button1_Click（object sender，EventArgs e）
{
if（newEvent！= null）
{
newEvent（ ）;
}
}
}
}
解决方案
查看您的代码：
private void dataGridView1_CellContentClick（ object sender，DataGridViewCellEventArgs e）
{
for （ int i = 0 ; i < = dataGridView1.RowCount - 1 ; i ++）
{
if （Convert.ToBoolean（dataGridView1.Rows [e.RowIndex] .Cells [ chkcol]。值= true ））
{
Frm2.ShowDialog（）;
break ;
}
}
}
你是 肯定 你想说= true ？
为什么你要将bool值转换成bool值呢？
而且，只是为了揉搓它一点，有什么区别：
if （myBool == true ）
和
if （myBool）除了显而易见的第一个更长，更不易读，容易出错？
我是实现一个功能。当在单击按钮关闭时选择form1中的任何datagridviewcheckboxcolumn并显示form2时，form1中的datagridviewcheckboxcolumn将为false？
http://vanhuynh.comoj.com/home/all%20pictrure/Ask%20Image/help%20delegate%20in%20csharp.png [ ^ ]
I'm implementing a function of two forms. While choosing any of datagridviewcheckboxcolumn in form1 and show form2 when click button to close , in the form1 datagridviewcheckboxcolumn will is false ?
Please help on this.
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
Form2 Frm2 = new Form2();
public Form1()
{
InitializeComponent();
DataGridViewCheckColumn();
Frm2.newEvent += new FrmCheckbox(Frm2_Event);
}
public void DataGridViewCheckColumn()
{
dataGridView1.ColumnCount = 6;
dataGridView1.AllowUserToAddRows = false;
DataGridViewCheckBoxColumn colCB = new
DataGridViewCheckBoxColumn();
colCB.Name = "chkcol";
colCB.HeaderText = "Select";
colCB.Width = 40;
dataGridView1.Columns.Add(colCB);
dataGridView1.Columns[0].Name = "C0";
dataGridView1.Columns[1].Name = "C1";
dataGridView1.Columns[2].Name = "C2";
dataGridView1.Columns[3].Name = "C3";
dataGridView1.Columns[4].Name = "C4";
dataGridView1.Columns[5].Name = "C5";
dataGridView1.Columns[0].HeaderText = "C0";
dataGridView1.Columns[1].HeaderText = "C1";
dataGridView1.Columns[2].HeaderText = "C2";
dataGridView1.Columns[3].HeaderText = "C3";
dataGridView1.Columns[4].HeaderText = "C4";
dataGridView1.Columns[5].HeaderText = "C5";
dataGridView1.Columns[0].Width = 40;
dataGridView1.Columns[1].Width = 40;
dataGridView1.Columns[2].Width = 40;
dataGridView1.Columns[3].Width = 40;
dataGridView1.Columns[4].Width = 40;
dataGridView1.Columns[5].Width = 40;
dataGridView1.Rows.Add(new string[] { "A1", "B1", "C1",
"D1", "E1", "F1" });
dataGridView1.Rows.Add(new string[] { "A2", "B2", "C2",
"D2", "E2", "F2" });
dataGridView1.Rows.Add(new string[] { "A3", "B3", "C3",
"D3", "E3", "F3" });
dataGridView1.Rows.Add(new string[] { "A4", "B4", "C4",
"D4", "E4", "F4" });
dataGridView1.Rows.Add(new string[] { "A5", "B5", "C5",
"D5", "E5", "F5" });
dataGridView1.Rows.Add(new string[] { "A6", "B6", "C6",
"D6", "E6", "F6" });
dataGridView1.Rows.Add(new string[] { "A7", "B7", "C7",
"D7", "E7", "F7" });
dataGridView1.AutoResizeColumns();
}
void Frm2_Event()
{
//for (int i = 0; i <= dataGridView1.Rows.Count - 1; i++)
//{
// if (Convert.ToBoolean(dataGridView1.Rows[i].Cells
["chkcol"].Value) == true )
// {
// dataGridView1.Rows[i].Cells["chkcol"].Value = false ;
// }
//}
foreach (DataGridViewRow row in dataGridView1.Rows)
{
if (Convert.ToBoolean(row.Cells["chkcol"].Value) == true)
{
row.Cells["chkcol"].Value = false;
}
}
}
private void dataGridView1_CellContentClick(object sender,
DataGridViewCellEventArgs e)
{
for (int i = 0; i <= dataGridView1.RowCount - 1; i++)
{
if (Convert.ToBoolean(dataGridView1.Rows
[e.RowIndex].Cells["chkcol"].Value = true))
{
Frm2.ShowDialog();
break;
}
}
}
}
}
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public delegate void FrmCheckbox();
public partial class Form2 : Form
{
public event FrmCheckbox newEvent;
public Form2()
{
InitializeComponent();
//button1.Click +=new EventHandler (button1_Click );
}
private void button1_Click(object sender, EventArgs e)
{
if (newEvent != null)
{
newEvent();
}
}
}
} 解决方案
Look at your code:
private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e) { for (int i = 0; i <= dataGridView1.RowCount - 1; i++) { if (Convert.ToBoolean(dataGridView1.Rows[e.RowIndex].Cells["chkcol"].Value = true)) { Frm2.ShowDialog(); break; } } }Are you sure you meant to say "= true"?
And why are you converting what should be a bool value to a bool value anyway?
And, just to rub it in a bit, what is the difference between:
if (myBool == true)
and
if (myBool)Apart from the obvious "the first one is longer, less readable and prone to error"?
I'm implementing a function. While choosing any of datagridviewcheckboxcolumn in form1 and show form2 when click button to close, datagridviewcheckboxcolumn in the form1 will is false ?
http://vanhuynh.comoj.com/home/all%20pictrure/Ask%20Image/help%20delegate%20in%20csharp.png[^]
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