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有時(shí)候在一個(gè)窗體中有比較多的RadioButton，它們往往是作為取數(shù)據(jù)、業(yè)務(wù)邏輯等操作的條件。例如下圖例子所示：

用戶(hù)選擇“全部”則會(huì)帶出全部符合條件數(shù)據(jù)、選擇了“已審核”則會(huì)取出全部符合條件的已經(jīng)審核過(guò)后的數(shù)據(jù).......我們一般的處理方法是每個(gè)RadioButton控件有一個(gè)CheckedChanged事件。如下面代碼所示

代碼

private void rdAll_CheckedChanged(object sender, EventArgs e)
??????? {
if (rdAll.Checked)
??????????? {
this.gvData.DataSource = GetDataSource("ALL");
??????????? }
??????? }
private void rdAudit_CheckedChanged(object sender, EventArgs e)
??????? {
if (rdAudit.Checked)
??????????? {
this.gvData.DataSource = GetDataSource("Audit");
??????????? }
??????? }
private void rdNotAudit_CheckedChanged(object sender, EventArgs e)
??????? {
if (rdNotAudit.Checked)
??????????? {
this.gvData.DataSource = GetDataSource("NotAudit");
??????????? }
??????? }
private void rdBilled_CheckedChanged(object sender, EventArgs e)
??????? {
if (rdBilled.Checked)
??????????? {
this.gvData.DataSource = GetDataSource("Bill");
??????????? }
??????? }
private void rdUnBill_CheckedChanged(object sender, EventArgs e)
??????? {
if (rdUnBill.Checked)
??????????? {
this.gvData.DataSource = GetDataSource("UnBill");
??????????? }
??????? }

當(dāng)窗體的RadioButton控件比價(jià)多時(shí)，那么放眼望去，代碼里面到處都是CheckedChanged事件、簡(jiǎn)直有如洪水泛濫。呵呵

其實(shí)我們可以委托來(lái)改進(jìn)代碼、這樣可以讓代碼看起來(lái)簡(jiǎn)潔、邏輯清晰、代碼量大量減少（當(dāng)然這個(gè)例子不能夠證明）。下面看看是如何改進(jìn)的吧：

???? 我們把所有RadioButton控件的CheckedChanged事件用同一個(gè)事件替換。 如下圖所示，

代碼

private void RadioBtn_CheckedChanged(object sender, EventArgs e)
??????? {
if (!((RadioButton)sender).Checked) return;
string filterValue = string.Empty;
switch (((RadioButton)sender).Tag.ToString())
??????????? {
case "ALL":
??????????????????? filterValue = "ALL";
break;
case "Audit":
??????????????????? filterValue = "Audit";
break;
case "NotAudit":
??????????????????? filterValue = "NotAudit";
break;
case "Bill":
??????????????????? filterValue = "Bill";
break;
case "UnBill":
??????????????????? filterValue = "UnBill";
break;
??????????? }
this.gvData.DataSource = GetDataSource(filterValue);
??????? }

這樣處理那么就可以共用許多相同的代碼（這個(gè)簡(jiǎn)單的例子沒(méi)有體現(xiàn)）。讓代碼界面簡(jiǎn)明清晰不少！

WinForm的RadioButton使用小技巧