c# - 更改滚动条的值

Question

我正在创建一个颜色选择器，并且我有一个“输入”和“输出”。在输入中我有 4 个滚动条，在输出中我有一个预览，以及 3 个带有输出的文本框。

单击预览时，将打开一个带有颜色对话框的窗口。它适用于十六进制并返回一个十六进制值。

但是，我想将它返回的十六进制值放在滚动条中。

我认为我必须将其转换为 RGB 或 Int，然后设置滚动条值。

我怎样才能做到这一点？

图片框中的代码：

    private void pictureBox1_Click(object sender, EventArgs e)
    {
        if (colorDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
        {
            pictureBox1.BackColor = colorDialog1.Color;
            string color, colorRGB;
            color = string.Format("{0:X8}", pictureBox1.BackColor.ToArgb());
            colorRGB = string.Format("{0:X6}", pictureBox1.BackColor.ToArgb());
            hexResult = color;
            pawnTextBox.Text = "#define " + colorNameTxtBox.Text + " 0x" + hexResult;
            hexTextBox.Text = "0x" + hexResult;
        }
    }

滚动条中的代码：

    private void alphaScroll_Scroll(object sender, ScrollEventArgs e)
    {
        Color previewColor = Color.FromArgb(alphaScroll.Value, redScroll.Value, greenScroll.Value, blueScroll.Value);
        pictureBox1.BackColor = previewColor;

        int colorHex = alphaScroll.Value | (blueScroll.Value << 8) | (greenScroll.Value << 16) | (redScroll.Value << 24);
        hexResult = "0x" + string.Format("{0:X}", colorHex.ToString("X8"));

        hexTextBox.Text = hexResult;
        pawnTextBox.Text = "#define " + colorNameTxtBox.Text + " " + hexResult;
        alphaResultLabel.Text = alphaScroll.Value.ToString();
    }

    private void redScroll_Scroll(object sender, ScrollEventArgs e)
    {
        Color previewColor = Color.FromArgb(alphaScroll.Value, redScroll.Value, greenScroll.Value, blueScroll.Value);
        pictureBox1.BackColor = previewColor;

        int colorHex = alphaScroll.Value | (blueScroll.Value << 8) | (greenScroll.Value << 16) | (redScroll.Value << 24);
        hexResult = "0x" + string.Format("{0:X}", colorHex.ToString("X8"));

        int red = redScroll.Value;
        int green = greenScroll.Value;
        int blue = blueScroll.Value;

        getColorTxtBox.Text = red.ToString("X2") + green.ToString("X2") + blue.ToString("X2");
        embeddTextBox.Text = "{" + red.ToString("X2") + green.ToString("X2") + blue.ToString("X2") + "}";
        hexTextBox.Text = hexResult;
        pawnTextBox.Text = "#define " + colorNameTxtBox.Text + " " + hexResult;
        redResultLabel.Text = redScroll.Value.ToString();
    }

    private void greenScroll_Scroll(object sender, ScrollEventArgs e)
    {
        Color previewColor = Color.FromArgb(alphaScroll.Value, redScroll.Value, greenScroll.Value, blueScroll.Value);
        pictureBox1.BackColor = previewColor;

        int colorHex = alphaScroll.Value | (blueScroll.Value << 8) | (greenScroll.Value << 16) | (redScroll.Value << 24);
        hexResult = "0x" + string.Format("{0:X}", colorHex.ToString("X8"));

        int red = redScroll.Value;
        int green = greenScroll.Value;
        int blue = blueScroll.Value;

        getColorTxtBox.Text = red.ToString("X2") + green.ToString("X2") + blue.ToString("X2");
        embeddTextBox.Text = "{" + red.ToString("X2") + green.ToString("X2") + blue.ToString("X2") + "}";
        hexTextBox.Text = hexResult;
        pawnTextBox.Text = "#define " + colorNameTxtBox.Text + " " + hexResult;
        greenResultLabel.Text = greenScroll.Value.ToString();
    }

    private void blueScroll_Scroll(object sender, ScrollEventArgs e)
    {
        Color previewColor = Color.FromArgb(alphaScroll.Value, redScroll.Value, greenScroll.Value, blueScroll.Value);
        pictureBox1.BackColor = previewColor;

        int colorHex = alphaScroll.Value | (blueScroll.Value << 8) | (greenScroll.Value << 16) | (redScroll.Value << 24);
        hexResult = "0x" + string.Format("{0:X}", colorHex.ToString("X8"));

        int red = redScroll.Value;
        int green = greenScroll.Value;
        int blue = blueScroll.Value;

        getColorTxtBox.Text = red.ToString("X2") + green.ToString("X2") + blue.ToString("X2");
        embeddTextBox.Text = "{" + red.ToString("X2") + green.ToString("X2") + blue.ToString("X2") + "}";
        hexTextBox.Text = hexResult;
        pawnTextBox.Text = "#define " + colorNameTxtBox.Text + " " + hexResult;
        blueResultLabel.Text = blueScroll.Value.ToString();
    }

Answer 1

免责声明：这是作者在问题中发布的，替换了有问题的代码。我已经回滚了这个问题并将解决的代码放在这里，作为社区 wiki 答案。

---

如果有人遇到和我一样的问题，这里是解决方案：

string c = color.ToString();
string redHex = c.Substring(0, 2);
string greenHex = c.Substring(2, 2);
string blueHex = c.Substring(4, 2);
string alphaHex = c.Substring(6, 2);

int red = Convert.ToInt32(redHex, 16);
int green = Convert.ToInt32(greenHex, 16);
int blue = Convert.ToInt32(blueHex, 16);
int alpha = Convert.ToInt32(alphaHex, 16);

alphaScroll.Value = alpha;
redScroll.Value = red;
greenScroll.Value = green;
blueScroll.Value = blue;

alphaResultLabel.Text = alphaScroll.Value.ToString();
redResultLabel.Text = redScroll.Value.ToString();
greenResultLabel.Text = greenScroll.Value.ToString();
blueResultLabel.Text = blueScroll.Value.ToString();

Answer 2

.NET 中有一个功能：

Color c = System.Drawing.ColorTranslator.FromHtml(hmtlcolor);