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我試圖創建新的控件(TextBox,ComboBox和CheckBox)到Control.ControlCollection,但它不起作用。通常我的WinForm會將其控件傳遞給該方法,但現在我正在嘗試爲它編寫單元測試。將控件添加到Control.Collection
Here's代碼:
TestClass target = new TestClass();
Control.ControlCollection controls = null;
CheckBox checkBox = new CheckBox();
checkBox.Name = "SomeCheckBox";
checkBox.Checked = true;
ComboBox comboBox = new ComboBox();
comboBox.Name = "SomeComboBox";
checkBox.Text = "Some text in CB";
TextBox count = new TextBox();
count.Name = "CountTextBox";
count.Text = "20";
TextBox date = new TextBox();
date.Name = "DateNow";
date.Text = System.DateTime.Now.ToString("dd.MM.yyyy");
controls.AddRange(new Control[] {checkBox, comboBox, count, date });
string actual;
actual = target.saveEverything(controls);
測試中的AddRange-行失敗。我犯了什麼錯誤?
你永遠不會初始化'controls'。 – gunr2171
可能重複[什麼是NullReferenceException,我該如何解決它?](http://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-and-how-do-i-fix-it) – gunr2171
使那個'Control.ControlCollection controls = new Control.ControlCollection();' – TaW