我现在已经敲了近三天了。以下代码在没有MASTERPAGE的情况下工作很好。但是当我复制粘贴整个主页上的东西（它有一个主页）时，它不起作用并且给出了错误＆＃34;输入字符串格式不正确＆＃34;。
我想这段代码只有在我将其包含在表单标记中时才能生效，但我不能在contentplaceholder中使用表单标记。我可以解决这个问题吗？
btnUpload工作正常，但是当我点击btnCrop时会弹出错误。 html如下：
<form id="form1" runat="server">
<div style="width: 540px" runat="server">
<fieldset>
<legend>Upload, crop and save image in asp.net</legend>
<table>
<tr>
<td>
Select image to upload :
</td>
<td>
<asp:FileUpload ID="FileUpload1" runat="server" />
</td>
<td>
<asp:Button ID="btnUpload" runat="server" Text="Upload" OnClick="btnUpload_Click" />
</td>
</tr>
<tr>
<td colspan="3">
<asp:Image ID="imgCropped" Width="172px" Height="172px" runat="server" />
</td>
</tr>
<tr>
<td colspan="3">
<asp:Label ID="lblMsg" runat="server" ForeColor="Red" />
</td>
</tr>
<tr>
<td colspan="3">
<asp:Button ID="btnReset" runat="server" Text="Reset" Visible="false" OnClick="btnReset_Click" />
</td>
</tr>
</table>
<asp:Panel ID="pnlCrop" runat="server" Visible="false">
<table>
<tr>
<td>
<asp:Image ID="imgToCrop" runat="server" />
</td>
</tr>
<tr>
<td>
<asp:Button ID="btnCrop" runat="server" Text="Crop & Save" OnClick="btnCrop_Click" />
</td>
</tr>
<tr>
<td>
<input id="XCoordinate" type="hidden" runat="server" />
<input id="YCoordinate" type="hidden" runat="server" />
<input id="Width" type="hidden" runat="server" />
<input id="Height" type="hidden" runat="server" />
</td>
</tr>
</table>
</asp:Panel>
</fieldset>
</div>
</form>
如有必要，代码如下：
protected void btnUpload_Click(object sender, EventArgs e)
{
string fileName = string.Empty;
string filePath = string.Empty;
string extension = string.Empty;
try
{
//Check if Fileupload control has file in it
if (FileUpload1.HasFile)
{
// Get selected image extension
extension = Path.GetExtension(FileUpload1.FileName).ToLower();
//Check image is of valid type or not
if (extension == ".jpg" || extension == ".jpeg" || extension == ".png" || extension == ".gif" || extension == ".bmp")
{
//Cretae unique name for the file
fileName = Guid.NewGuid().ToString() + extension;
//Create path for the image to store
filePath = Path.Combine(Server.MapPath("/Images"), fileName);
//Save image in folder
FileUpload1.SaveAs(filePath);
//Show the panel and load the uploaded image in image control.
pnlCrop.Visible = true;
imgToCrop.ImageUrl = "/Images/" + fileName;
}
else
{
lblMsg.Text = "Please select jpg, jpeg, png, gif or bmp file only";
}
}
else
{
lblMsg.Text = "Please select file to upload";
}
}
catch (Exception ex)
{
lblMsg.Text = "Oops!! error occured : " + ex.Message.ToString();
}
finally
{
extension = string.Empty;
fileName = string.Empty;
filePath = string.Empty;
}
}
protected void btnCrop_Click(object sender, EventArgs e)
{
string croppedFileName = string.Empty;
string croppedFilePath = string.Empty;
//get uploaded image name
string fileName = Path.GetFileName(imgToCrop.ImageUrl);
//get uploaded image path
string filePath = Path.Combine(Server.MapPath("~/Images"), fileName);
//Check if file exists on the path i.e. in the UploadedImages folder.
if (File.Exists(filePath))
{
//Get the image from UploadedImages folder.
System.Drawing.Image orgImg = System.Drawing.Image.FromFile(filePath);
//Get user selected cropped area
//Convert.ToInt32(String.Format("{0:0.##}", YCoordinate.Value)),
Rectangle areaToCrop = new Rectangle(
Convert.ToInt32(XCoordinate.Value),
Convert.ToInt32(YCoordinate.Value),
Convert.ToInt32(Width.Value),
Convert.ToInt32(Height.Value));
try
{
Bitmap bitMap = new Bitmap(areaToCrop.Width, areaToCrop.Height);
//Create graphics object for alteration
using (Graphics g = Graphics.FromImage(bitMap))
{
//Draw image to screen
g.DrawImage(orgImg, new Rectangle(0, 0, bitMap.Width, bitMap.Height), areaToCrop, GraphicsUnit.Pixel);
}
//name the cropped image
croppedFileName = "crop_" + fileName;
//Create path to store the cropped image
croppedFilePath = Path.Combine(Server.MapPath("~/Images"), croppedFileName);
//save cropped image in folder
bitMap.Save(croppedFilePath);
orgImg.Dispose();
bitMap = null;
//Now you can delete the original uploaded image from folder
File.Delete(filePath);
//Hide the panel
pnlCrop.Visible = false;
//Show success message in label
lblMsg.ForeColor = Color.Green;
lblMsg.Text = "Image cropped and saved successfully";
//Show cropped image
imgCropped.ImageUrl = "~/Images/" + croppedFileName;
string CS = ConfigurationManager.ConnectionStrings["SportsActiveConnectionString"].ConnectionString;
using (SqlConnection con = new SqlConnection(CS))
{
con.Open();
SqlCommand cmd = new SqlCommand("spLogo", con);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@LogoPath", "Images/" + croppedFileName);
cmd.ExecuteNonQuery();
}
//Show Reset button
btnReset.Visible = true;
}
catch (Exception ex)
{
lblMsg.Text = "Oops!! error occured : " + ex.Message.ToString();
}
finally
{
fileName = string.Empty;
filePath = string.Empty;
croppedFileName = string.Empty;
croppedFilePath = string.Empty;
}
}
}
答案 0 :(得分：0)
您的错误原因是从XCoordinate.Value，XCoordinate.Value等值转换为integer。在进行可能在提供的字符串中具有非整数值的转换时，您应该小心。
使用TryParse代替： -
int xCoordinate;
if(int.TryParse(XCoordinate.Value,out xCoordinate)
//your code
修改
如果转换从字符串转换为整数，则会发生此错误，如果转换成功，则TryParse方法将返回true，否则为false，如果转换成功，则将转换后的值分配给我们在方法（xCoordinate中传递的输出变量这种情况）。
int xCoordinate,yCoordinate,width,height;
if(int.TryParse(XCoordinate.Value,out xCoordinate) &&
int.TryParse(YCoordinate.Value,out yCoordinate) &&
int.TryParse(Width.Value,out width) && int.TryParse(Height.Value,out height))
{
Rectangle areaToCrop = new Rectangle(xCoordinate,yCoordinate,width,height)
}
else
{
//Throw error, use any default values etc.
}
答案 1 :(得分：0)
当您将带有身份input的aspx XCoordinate集成到母版页中时，输入的ID会从XCoordinate更改为ContentPlaceHolder1_XCoordinate。由于这个问题，隐藏的输入没有值，因此你的后端代码无法将空字符串解析为Int。
尝试将脚本替换为：
jQuery(document).ready(function () {
jQuery('#<%= imgToCrop.ClientID %>').Jcrop({
onSelect: updateCoords
});
});
function updateCoords(c) {
jQuery('#<%= XCoordinate.ClientID %>').val(c.x);
jQuery('#<%= YCoordinate.ClientID %>').val(c.y);
jQuery('#<%= Width.ClientID %>').val(c.w);
jQuery('#<%= Height.ClientID %>').val(c.h);
};