C# 当用户在文本框中键入任意金额的现金时，设置货币值的格式

当用户输入任意数量的现金时，自动设置货币值格式的最佳方法是什么

例如，我有一个文本框，如果用户输入“30”，它认为是0.30

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如果他输入“300”，它将考虑3.00。

制作一个文本框，并在

TextChanged

事件中处理它

<TextBox x:Name="money" Text="00.00" TextChanged="TextBox_TextChanged"/>

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您使用的UI框架可能存在重复？到目前为止您尝试了什么？选项1：构建自定义控件并侦听keydown事件。选项2：在后端有一个单独的隐藏文本框控件。每当显示文本框获得焦点时，只需将输入焦点传递到该隐藏框，并在那里执行逻辑

private void TextBox_TextChanged(object sender, TextChangedEventArgs e)
    {
        if (money.Text.Length == 3)
        {
            money.TextChanged -= TextBox_TextChanged;
            money.Text = money.Text.Replace("00.", "00.0");
            money.CaretIndex = money.Text.Length;
            money.TextChanged += TextBox_TextChanged;
        }
        if (money.Text.Length == 1)
        {
            money.TextChanged -= TextBox_TextChanged;
            if(money.Text.Contains(".")) money.Text = money.Text.Replace(".", "");
            money.Text = money.Text.Insert(0, "00.0");
            money.CaretIndex = money.Text.Length;
            money.TextChanged += TextBox_TextChanged;
        }
        else if (money.Text.StartsWith("00.0") && money.Text.Length == 6)
        {
            money.TextChanged -= TextBox_TextChanged;
            money.Text = money.Text.Replace("00.0", "00.");
            money.CaretIndex = money.Text.Length;
            money.TextChanged += TextBox_TextChanged;
        }
        else if (money.Text.StartsWith("00.") && money.Text.Length == 6)
        {
            money.TextChanged -= TextBox_TextChanged;
            money.Text = money.Text.Replace("00.", "0");
            money.Text = money.Text.Insert(money.Text.Length - 2, ".");
            money.CaretIndex = money.Text.Length;
            money.TextChanged += TextBox_TextChanged;
        }
        else if (money.Text.StartsWith("0") && money.Text.Length == 6)
        {
            money.TextChanged -= TextBox_TextChanged;
            money.Text = money.Text.Replace("0", "");
            if(money.Text.Contains(".")) money.Text = money.Text.Replace(".", "");
            money.Text = money.Text.Insert(money.Text.Length - 2, ".");
            money.CaretIndex = money.Text.Length;
            money.TextChanged += TextBox_TextChanged;
        }
        else if(!money.Text.StartsWith("0"))
        {
            money.TextChanged -= TextBox_TextChanged;
            if (money.Text.Length == 3 && money.Text.Contains(".")) money.Text = money.Text.Insert(0, "00");
            if(money.Text.Length == 4 && money.Text.Contains(".")) money.Text = money.Text.Insert(0, "0");
            if(money.Text.Length == 1 && !money.Text.Contains(".")) money.Text = money.Text.Insert(0, "00.0");
            if(money.Text.Length == 2 && !money.Text.Contains(".")) money.Text = money.Text.Insert(0, "00.");
            if (money.Text.Length == 3 && !money.Text.Contains(".")) money.Text = money.Text.Insert(0, "0");

            if (money.Text.Contains(".")) money.Text = money.Text.Replace(".", "");
            money.Text = money.Text.Insert(money.Text.Length - 2, ".");
            money.CaretIndex = money.Text.Length;
            money.TextChanged += TextBox_TextChanged;
        }
        else
        {
            money.TextChanged -= TextBox_TextChanged;
            if (money.Text.Length == 3 && money.Text.Contains(".")) money.Text = money.Text.Insert(0, "00");
            if (money.Text.Length == 4 && money.Text.Contains(".")) money.Text = money.Text.Insert(0, "0");
            if (money.Text.Length == 1 && !money.Text.Contains(".")) money.Text = money.Text.Insert(0, "00.0");
            if (money.Text.Length == 2 && !money.Text.Contains(".")) money.Text = money.Text.Insert(0, "00.");
            if (money.Text.Length == 3 && !money.Text.Contains(".")) money.Text = money.Text.Insert(0, "0");
            if (money.Text.Contains(".")) money.Text = money.Text.Replace(".", "");
            money.Text = money.Text.Insert(money.Text.Length - 2, ".");
            money.CaretIndex = money.Text.Length;
            money.TextChanged += TextBox_TextChanged;
        }
    }