很多數(shù)據(jù)都有父節(jié)點(diǎn)與子節(jié)點(diǎn),我們希望單擊父節(jié)點(diǎn)的時(shí)候可以展開父節(jié)點(diǎn)下的子節(jié)點(diǎn)數(shù)據(jù)。
比如一個(gè)醫(yī)院科室表,有父科室與子科室,點(diǎn)擊父科室后,在父科室下面可以展現(xiàn)該科室下的所有子科室。
我們來說一下在DataGridView中如何實(shí)現(xiàn)這個(gè)功能。
首先,創(chuàng)建示例數(shù)據(jù):
示例數(shù)據(jù)SQL
create table Department
(
ID int identity(1,1) not null,
DName varchar(20) null,
DparentId int null,
Dtelphone varchar(20) null,
Dhospital varchar(50) null
)
insert into Department values('門診外室',1,'1111','XXX醫(yī)院')
insert into Department values('門診內(nèi)科',1,'2222','XXX醫(yī)院')
insert into Department values('門診手術(shù)',1,'3333','XXX醫(yī)院')
insert into Department values('門診兒科',1,'4444','XXX醫(yī)院')
insert into Department values('神經(jīng)內(nèi)室',2,'5555','XXX醫(yī)院')
insert into Department values('神經(jīng)外科',2,'6666','XXX醫(yī)院')
insert into Department values('住院手術(shù)',2,'7777','XXX醫(yī)院')
insert into Department values('住院康復(fù)',2,'8888','XXX醫(yī)院')
其實(shí)思路很簡(jiǎn)單,就是在展開父節(jié)點(diǎn)的時(shí)候,在父節(jié)點(diǎn)下插入新的DataGridViewRow;收縮父節(jié)點(diǎn)的時(shí)候,在父節(jié)點(diǎn)下刪除該子節(jié)點(diǎn)的DataGridViewRow。
為了簡(jiǎn)便,代碼中的數(shù)據(jù)讀取我都直接硬編碼了。
加載父節(jié)點(diǎn)數(shù)據(jù),除了數(shù)據(jù)庫(kù)中的列外我還新加了兩列:IsEx與EX。
private void DataGridBing(DataTable table)
{
if (table.Rows.Count > 0)
{
for (int i = 0; i table.Rows.Count; i++)
{
int k = this.dataGridView1.Rows.Add();
DataGridViewRow row = this.dataGridView1.Rows[k];
row.Cells["ID"].Value = table.Rows[i]["ID"];
row.Cells["DName"].Value = table.Rows[i]["DName"];
row.Cells["Daddress"].Value = table.Rows[i]["Daddress"];
row.Cells["Dtelphone"].Value = table.Rows[i]["Dtelphone"];
//用于顯示該行是否已經(jīng)展開
row.Cells["IsEx"].Value = "false";
//用于顯示展開或收縮符號(hào),為了簡(jiǎn)單我就直接用字符串了,其實(shí)用圖片比較美觀
row.Cells["EX"].Value = "+";
}
}
}
下面就是Cell的單擊事件了,分別在事件中寫展開的插入與收縮的刪除.
插入子節(jié)點(diǎn):
string isEx=this.dataGridView1.Rows[e.RowIndex].Cells["IsEx"].Value.ToString();
if (this.dataGridView1.Columns[e.ColumnIndex].Name == "EX" isEx=="false")
{
string id = this.dataGridView1.Rows[e.RowIndex].Cells["ID"].Value.ToString();
DataTable table = GetDataTable("select * from Department where DparentId="+id);
if (table.Rows.Count > 0)
{
//插入行
this.dataGridView1.Rows.Insert(e.RowIndex+1, table.Rows.Count);
for (int i = 0; i table.Rows.Count; i++)
{
DataGridViewRow row = this.dataGridView1.Rows[e.RowIndex + i+1];
row.DefaultCellStyle.BackColor = Color.CadetBlue;
row.Cells["ID"].Value = table.Rows[i]["ID"];
row.Cells["DName"].Value = table.Rows[i]["DName"];
row.Cells["Daddress"].Value = table.Rows[i]["Daddress"];
row.Cells["Dtelphone"].Value = table.Rows[i]["Dtelphone"];
}
}
//將IsEx設(shè)置為true,標(biāo)明該節(jié)點(diǎn)已經(jīng)展開
this.dataGridView1.Rows[e.RowIndex].Cells["IsEx"].Value = "true";
this.dataGridView1.Rows[e.RowIndex].Cells["EX"].Value = "-";
刪除子節(jié)點(diǎn):
if (this.dataGridView1.Columns[e.ColumnIndex].Name == "EX" isEx == "true")
{
string id = this.dataGridView1.Rows[e.RowIndex].Cells["ID"].Value.ToString();
DataTable table = GetDataTable("select * from Department where DparentId=" + id);
if (table.Rows.Count > 0)
{
//利用Remove
for (int i = 0; i table.Rows.Count; i++)
{
foreach (DataGridViewRow row in this.dataGridView1.Rows)
{
if (row.Cells["ID"].Value.Equals(table.Rows[i]["ID"]))
{
this.dataGridView1.Rows.Remove(row);
}
}
}
}
////將IsEx設(shè)置為false,標(biāo)明該節(jié)點(diǎn)已經(jīng)收縮
this.dataGridView1.Rows[e.RowIndex].Cells["IsEx"].Value = "false";
this.dataGridView1.Rows[e.RowIndex].Cells["EX"].Value = "+";
}
這里面通過比較ID來唯一確定一行,循環(huán)比較多,因?yàn)樽庸?jié)點(diǎn)是緊接著父節(jié)點(diǎn)的,我們可以確定子節(jié)點(diǎn)所在的行數(shù),所以用RemoveAt()方法更好。
//利用RemoveAt
for (int i = table.Rows.Count; i > 0; i--)
{
//刪除行
this.dataGridView1.Rows.RemoveAt(i + e.RowIndex);
}
上面的做法是通過不斷的插入與刪除來實(shí)現(xiàn),但這樣與數(shù)據(jù)庫(kù)的交互變得很頻繁。更好的做法應(yīng)該是插入一次,然后通過隱藏或顯示行來實(shí)現(xiàn)我們的效果。
為此,我們還要在grid中新增兩個(gè)列:
IsInsert:用來判斷該行是否已經(jīng)有插入子節(jié)點(diǎn)數(shù)據(jù)
RowCount:用來保存該行下插入的子節(jié)點(diǎn)數(shù)量。
在方法DataGridBing中,綁定數(shù)據(jù)時(shí),應(yīng)該再加一列:
//是否插入
row.Cells["IsInsert"].Value = "false";
而在增加節(jié)點(diǎn)的時(shí)候,我們要多做一個(gè)判斷,如果IsInsert為false就插入數(shù)據(jù),如果為true就顯示數(shù)據(jù)
展開行
if (this.dataGridView1.Columns[e.ColumnIndex].Name == "EX" isEx=="false")
{
if (this.dataGridView1.Rows[e.RowIndex].Cells["IsInsert"].Value.ToString() == "false")
{
string id = this.dataGridView1.Rows[e.RowIndex].Cells["ID"].Value.ToString();
DataTable table = GetDataTable("select * from Department where DparentId=" + id);
if (table.Rows.Count > 0)
{
//插入行
this.dataGridView1.Rows.Insert(e.RowIndex + 1, table.Rows.Count);
for (int i = 0; i table.Rows.Count; i++)
{
DataGridViewRow row = this.dataGridView1.Rows[e.RowIndex + i + 1];
row.DefaultCellStyle.BackColor = Color.CadetBlue;
row.Cells["ID"].Value = table.Rows[i]["ID"];
row.Cells["DName"].Value = table.Rows[i]["DName"];
row.Cells["Daddress"].Value = table.Rows[i]["Daddress"];
row.Cells["Dtelphone"].Value = table.Rows[i]["Dtelphone"];
}
this.dataGridView1.Rows[e.RowIndex].Cells["IsInsert"].Value = "true";
this.dataGridView1.Rows[e.RowIndex].Cells["RowCount"].Value = table.Rows.Count;
}
}
else
{
//顯示數(shù)據(jù)
int RowCount = Convert.ToInt32(this.dataGridView1.Rows[e.RowIndex].Cells["RowCount"].Value);
for (int i = 1; i = RowCount; i++)
{
this.dataGridView1.Rows[e.RowIndex + i].Visible = true;
}
}
//將IsEx設(shè)置為true,標(biāo)明該節(jié)點(diǎn)已經(jīng)展開
this.dataGridView1.Rows[e.RowIndex].Cells["IsEx"].Value = "true";
this.dataGridView1.Rows[e.RowIndex].Cells["EX"].Value = "-";
}
收縮的時(shí)候,我們直接隱藏行就可以了.
收縮行
if (this.dataGridView1.Columns[e.ColumnIndex].Name == "EX" isEx == "true")
{
int RowCount = Convert.ToInt32(this.dataGridView1.Rows[e.RowIndex].Cells["RowCount"].Value);
for (int i = 1; i = RowCount; i++)
{
//隱藏行
this.dataGridView1.Rows[e.RowIndex + i].Visible = false;
}
////將IsEx設(shè)置為false,標(biāo)明該節(jié)點(diǎn)已經(jīng)收縮
this.dataGridView1.Rows[e.RowIndex].Cells["IsEx"].Value = "false";
this.dataGridView1.Rows[e.RowIndex].Cells["EX"].Value = "+";
}
大家知道DataGridView是如何實(shí)現(xiàn)展開收縮的吧,希望大家不僅知道是如何實(shí)現(xiàn)的還要?jiǎng)邮謱?shí)驗(yàn)一番,才不枉小編辛苦整理此文章哦
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