WPF 學習筆記（五）

一、不可空資料型別 int datetime boolean

string str1 = "";

string s1 = null;
messagebox.show(str1.length.tostring());
//空指標會引發異常
int? i1 = null;
int i2 = 6;
i1 = i2;
int? i3 = null;    //error
//int i4 = i3;
int i4 = (int)i3;  //ok,但是如果傳入的是null型別，會引發異常

二、常用控制項

1、passwordbox  屬性password，設定預設密碼

2、checkbox 屬性ischecked  預設返回boolean? 可空資料型別，因此可以用 == true方法解決是比較好的

private void checkbox1_checked(object sender, routedeventargs e)

}

3、radiobutton  groupname屬性 組的名稱

"

name
" content="
radiobutton
" height="
16" horizontalalignment="
left
" margin="
111,122,0,0
" name="
radiobutton1
" verticalalignment="
top" />
"name
" content="
radiobutton
" height="
16" horizontalalignment="
left
" margin="
111,144,0,0
" name="
radiobutton2
" verticalalignment="
top" />
"name
" content="
radiobutton
" height="
16" horizontalalignment="
left
" margin="
111,166,0,0
" name="
radiobutton3
" verticalalignment="
top" />
"age
" content="
radiobutton
" height="
16" horizontalalignment="
left
" margin="
269,131,0,0
" name="
radiobutton4
" verticalalignment="
top" />
"age
" content="
radiobutton
" height="
16" horizontalalignment="
left
" margin="
269,153,0,0
" name="
radiobutton5
" verticalalignment="
top" />

4、datepicker 控制項 selecteddate 賦予時間，獲取時間

private

void button1_click(object
sender, routedeventargs e)
else
}private
void button2_click(object
sender, routedeventargs e)

5、progressbar  控制項 屬性maximum、minimum、value、isindeterminate（用於不可控因素）

maximum="

100"
minimum="0"
value="
10" height="
10" horizontalalignment="
left
" margin="
24,197,0,0
" name="
progressbar1
" verticalalignment="
top" width="
100" />
isindeterminate="
true
" height="
10" horizontalalignment="
left
" margin="
174,197,0,0
" name="
progressbar2
" verticalalignment="
top" width="
100" />
"加血" height="
23" horizontalalignment="
left
" margin="
24,213,0,0
" name="
button3
" verticalalignment="
top" width="
75" click="
button3_click
" />

private

void button3_click(object
sender, routedeventargs e)

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