Question

不幸的是，我不知道问题是否已经被问到，这就是我在这里做的原因。我想知道你是否可以在这里简化一个例子：

if (textbox1.text == "" && textbox2.text == "" && textbox3.text == "") {
   label1.text = "Empty boxes.";
}
if (textbox1.text == "is playing" && textbox2.text == "" && textbox3.text == "") {
   label1.text = "player is playing";
}
if (textbox1.text == "" && textbox2.text == "online" && textbox3.text == "vip") {
   label1.text = "player is online and is vip";
}

如果已经提出这个问题，我真的很抱歉，但我没有找到。问候。

编辑：这是另一个例子

if (textbox1.text != "" && textbox2.text == "" && textbox3 == "")
                    label1.Text = "1 are not empty"
                if (textbox1.text == "" && textbox2.text != "" && textbox3 == "")
                    label1.Text = "2 are not empty"
                if (textbox1.text != "" && textbox2.text != "" && textbox3 == "")
                    label1.Text = "1 & 2 are not empty"
                if (textbox1.text == "" && textbox2.text != "" && textbox3 != "")
                    label1.Text = "2 & 3 are not empty"
                if (textbox1.text != "" && textbox2.text == "" && textbox3 != "")
                    label1.Text = "1 & 3 are not empty"
                if (textbox1.text == "" && textbox2.text == "" && textbox3 == "")
                    label1.Text = "boxes empty";

Answer 1

我对你的问题的理解是，你想测试一些平等组合。基本上你有一个真理表＆＃34; /可能的输入和输出之间的映射。有几种方法可以做到这一点;下面是使用字典将可能的输入映射到可能的输出的示例：

在您的实际功能中输入以下内容：

//put the above to use in finding what value to assign
var key = new ThreeValueKey(textbox1.text, textbox2.text, textbox3.text);
label1.text = ResultMap.TryGetValue(key, out var value) ? value : DefaultResult;

为此，您需要拥有以下课程：

//create some way of holding your "rules".  
class ThreeValueKey {
    public string Key1 {get;set;}
    public string Key2 {get;set;}
    public string Key3 {get;set;}
}

...而且您需要定义规则

//map each of the possible rules to the value:
static readonly IDictionary<ThreeValueKey, string> ResultMap = new Dictionary<ThreeValueKey, string>() {
    {new ThreeValueKey {Key1 = string.Empty, Key2 = string.Empty, Key3 = string.Empty}, "Empty boxes."}
    ,{new ThreeValueKey {Key1 = "is playing", Key2 = string.Empty, Key3 = string.Empty}, "player is playing"}
    ,{new ThreeValueKey {Key1 = string.Empty, Key2 = "online", Key3 = "vip"}, "player is online and is vip"}
};
//if there's no match, what should we do?  Assign a default value?
const string DefaultResult = "whatever to put if there's no match";

Answer 2

也许你可以使用：

label1.text = (textbox1.text=="" && textbox2.text == "" && textboxt3.text=="") ? "Empty Boxes" : "Player is" + textbox1.text + textbox2.text + textbox3.text;

通过一些格式化，您可以提供单词＆＃34;和＆＃34;或＆＃34;＆amp;＆＃34;等

Answer 3

我建议您查看StringBuilder课程。

Documentation

Example of usage

以下是使用StringBuilder“简化”第二个代码示例的代码示例：

StringBuilder text = new StringBuilder();
if (textbox1.Text == "" && textbox2.Text == "" && textbox3.Text == "")
{
    text.Append("boxes empty");
}
else
{
    int count = 0;
    text.Append(CheckTextBox(textbox1, ref count, 1));
    text.Append(CheckTextBox(textbox2, ref count, 2));
    text.Append(CheckTextBox(textbox3, ref count, 3));

    text.Append("are not empty");
} 

label1.Text = text.ToString();

public string CheckTextBox(TextBox textbox, ref int count, int boxNumber)
{
    string text = "";
    if (!string.IsNullOrEmpty(textbox.Text))
    {
        if (count > 0)
        {
            text += "& ";
        }
        text+=$"{boxNumber} ";
    }
    return text;
}

简化文本框中的if语句？

3 个答案: