[英]How to pass windows authentication from “.aspx” page to “.ashx” handler
[英]How to pass hex string color from .aspx to .ashx
我如何將十六進制字符串值傳遞到我的.ashx頁面,在System.Drawing.Color中需要它
如果我傳遞一個普通的字符串,如:
string name="John"
一切正常。
但是,如果我嘗試像這樣傳遞十六進制值:
string bg_color ="#000000"
.ashx頁面上的字符串為空或“”
已經嘗試僅傳遞不帶#的值,這實際上是有效的。 但是如果我以后添加#
Color _bgClr = ColorTranslator.FromHtml(string.Format{"#{0}", text_background_color);
當我嘗試更改Webform上的HEX(背景值)時,出現#無效參數錯誤。
有什么線索嗎?
請幫忙
UPDATE
<img class="link-realtime1" src="ImageGen.ashx?bo=<%=inp_barva_ozadja.Text %>&bt=<%=inp_barva_teksta.Text %>" style="float: left;margin-top: -20px;"/>
UPDATE2-.aspx
<form id="image_generator" runat="server">
<div class="main">
<div class="controls">
<div class="options" style="float: left;width: 50%;">
<label>
<span>Širina</span>
<asp:TextBox ID="inp_sirina" Width="125" runat="server"></asp:TextBox>
</label><span style="color:red"><asp:Literal ID="napaka_s" runat="server"></asp:Literal></span><br />
<label>
<span>Višina</span>
<asp:TextBox ID="inp_visina" Width="125" runat="server"></asp:TextBox>
</label><span style="color:red"><asp:Literal ID="napaka_v" runat="server"></asp:Literal></span><br />
<label>
<span>Tekst</span>
<asp:TextBox ID="inp_text" Width="125" runat="server"></asp:TextBox>
</label><span style="color:red"><asp:Literal ID="napaka_t" runat="server"></asp:Literal></span><br />
<label>
<span>Velikost pisave</span>
<asp:TextBox ID="inp_velikost" Width="125px" runat="server"></asp:TextBox>
</label><span style="color:red"><asp:Literal ID="napaka_vp" runat="server"></asp:Literal></span><br />
<label>
<span>Barva ozadja</span>
<asp:TextBox ID="inp_barva_ozadja" Width="125px" runat="server"></asp:TextBox>
</label><span style="color:red"><asp:Literal ID="napaka_bo" runat="server"></asp:Literal></span><br />
<label>
<span>Barva teksta</span>
<asp:TextBox ID="inp_barva_teksta" Width="125px" runat="server"></asp:TextBox>
</label><span style="color:red"><asp:Literal ID="napaka_bt" runat="server"></asp:Literal></span><br />
<div id="colorpicker"></div><br />
<script type="text/javascript">
$(document).ready(function () {
$('#colorpicker').farbtastic('#inp_barva_ozadja');
});
</script>
<a class="link-realtime" href="ImageGen.ashx?w=<%= inp_sirina.Text %>&h=<%= inp_visina.Text %>&t=<%= inp_text.Text %>&ts=<%= inp_velikost.Text %>&bg=<%= inp_barva_ozadja.Text %>&tc=<%= inp_barva_teksta.Text %>">Generiraj sliko</a><br />
</div>
<script type="text/javascript">
$('#inp_sirina, #inp_visina, #inp_barva_ozadja, #inp_barva_teksta, #inp_text, #inp_velikost').keyup(function () {
var tekst1 = $('#inp_sirina').val();
var tekst2 = $('#inp_visina').val();
var tekst3 = $('#inp_text').val();
var v_pisave = $('#inp_velikost').val();
var barva1 = $('#inp_barva_ozadja').val();
var barva2 = $('#inp_barva_teksta').val();;
var path = "ImageGen.ashx?w=" + tekst1 + "&h=" + tekst2 + "&t=" + tekst3 + "&ts=" + v_pisave + "&bg=" + barva1 + "&tc=" + barva2;
$("a.link-realtime").attr("href", path);
$("img.link-realtime1").attr("src", path);
});
</script>
<div id="output">
<span class="output-result"></span></br>
<img class="link-realtime1" src="ImageGen.ashx?w=<%= inp_sirina.Text %>&h=<%= inp_visina.Text %>&t=<%= inp_text.Text %>&ts=<%= inp_velikost.Text %>&bo=<%=inp_barva_ozadja.Text %>&bt=<%=inp_barva_teksta.Text %>" style="float: left;margin-top: -20px;"/>
</div></br>
</div>
</div>
</form>
UPDATE3-.ashx
public void ProcessRequest(HttpContext context)
{
string _width = context.Request.QueryString["w"];
int __width = Convert.ToInt32(_width);
string _height = context.Request.QueryString["h"];
int __height = Convert.ToInt32(_height);
string text = context.Request.QueryString["t"];
string text_size = context.Request.QueryString["ts"];
int _text_size = Convert.ToInt32(text_size);
/*string text_background_color = context.Request.QueryString["bo"];*/
string text_background_color = "#000000";
Color _bgClr = ColorTranslator.FromHtml(text_background_color);
/*Color _bgClr = ColorTranslator.FromHtml(string.Format("{0}", "#" + text_background_color));*/
/*string text_color = context.Request.QueryString["bt"];*/
string text_color = "#FFFFFF";
Color _txtClr = ColorTranslator.FromHtml(text_color);
Bitmap slika = new Bitmap(1, 1);
float koordinataX = (__width / 2) - (((__width / 2) / 2) / 2);
float koordinataY = (__height / 2);
if (koordinataX < 50)
{
_text_size = _text_size / 2;
}
text = Regex.Replace(text, "(.{" + 20 + "})", "$1" + Environment.NewLine);
Font pisava = new Font("Verdana", _text_size, FontStyle.Bold, GraphicsUnit.Point);
Graphics graphics = Graphics.FromImage(slika);
slika = new Bitmap(slika, new Size(__width, __height));
graphics = Graphics.FromImage(slika);
graphics.Clear(_bgClr);
graphics.TextRenderingHint = TextRenderingHint.AntiAlias;
using (var sf = new StringFormat()
{
Alignment = StringAlignment.Center,
LineAlignment = StringAlignment.Center
})
{
graphics.DrawString(text, pisava, new SolidBrush(_txtClr), new Rectangle(0, 0, slika.Width, slika.Height), sf);
}
/*graphics.DrawString(text, pisava, new SolidBrush(_txtClr), koordinataX, koordinataY);*/
MemoryStream ms = new MemoryStream();
slika.Save(ms, ImageFormat.Png);
byte[] bajt = ms.ToArray();
context.Response.ContentType = "image/png";
context.Response.BinaryWrite(bajt);
context.Response.Flush();
}
您的string.Format
代碼不正確。 應該
string.Format("{0}", "#" + text_background_color)
但是你可以沒有。
string text_background_color = "FF00FC";
Color _bgClr = ColorTranslator.FromHtml("#" + text_background_color);
UPDATE
您正在轉換QueryString參數而不檢查NULL值,因此,如果一個或多個QueryString不存在或為空,則代碼將失敗。 它與設置顏色無關。
string _width = context.Request.QueryString["w"];
string _height = context.Request.QueryString["h"];
string text = context.Request.QueryString["t"];
string text_size = context.Request.QueryString["ts"];
string text_background_color = context.Request.QueryString["bg"];
int __width = 300;
int __height = 200;
int __text_size = 10;
if (!string.IsNullOrEmpty(_width))
{
__width = Convert.ToInt32(_width);
}
if (!string.IsNullOrEmpty(_height))
{
__height = Convert.ToInt32(_height);
}
if (!string.IsNullOrEmpty(text_size))
{
__text_size = Convert.ToInt32(text_size);
}
if (!string.IsNullOrEmpty(text_background_color))
{
text_background_color = "#" + text_background_color;
}
else
{
text_background_color = "#000000";
}
我認為參數bg_color
的值的簡單url編碼如下:
<img class="link-realtime1" src="ImageGen.ashx?w=<%= inp_sirina.Text %>&h=<%= inp_visina.Text %>&t=<%= inp_text.Text %>&ts=<%= inp_velikost.Text %>&bo=<%=inp_barva_ozadja.Text %>&bt=<%=inp_barva_teksta.Text %>&bg_color=<%=HttpUtility.UrlEncode("#000000") %>" style="float: left;margin-top: -20px;"/>
可以在通用處理程序中檢索,如下所示:
var bgColor = context.Request.QueryString["bg_color"];
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