如何解决错误“输入字符串格式不正确”。 [英] How do I solve the error "Input string was not in a correct format."

问题描述

大家好，我在Visual Studio 2008中的第一个asp.net Web应用程序遇到了一个新问题，错误是

 System.FormatException：输入字符串的格式不正确。 pre>。我在网上搜索这个错误，但我还没有得到任何具体的解决方案。所以请帮我弄清楚这个错误。下面是Admin / ManageProducts.aspx和Admin / ManageProducts的代码.aspx.cs文件分别为：
 
 
 
 
 <   / head  >  
 <  < span class =code-leadattribute> body  >  
 <  表格    id   =  form1    runat   =  server >  
 <   div  >  
 <   asp ：DropDownList     ID   =  DropDownList1    runat   =  server    AutoPostBack   =  True  
   
                           DataSourceID   =  ObjectDataSource1 >  
 <   / asp：DropDownList  >  
 <   asp：ObjectDataSource     ID   =  ObjectDataSource1    runat   =  server  
   
                           SelectMethod   =  GetAll    TypeName   =  BusinessLogic.CategoriesBL >  <   / asp：ObjectDataSource  >  
 
 
 <   asp ：GridView     ID   =  GridView1    runat   =  server    AutoGenerateColumns   =  False  
   
                           DataSourceID   =  ObjectDataSource2     DataKeyNames   = < span class =code-keyword> Id >  
 <  列 >  
 <   asp：CommandField     ShowDeleteButton   =  True    ShowSelectButton   =  True    /  >  
 <   asp：BoundField     DataField   =  Id    HeaderText   =  Id    SortExpression   =  Id    /  >  
 <   asp：BoundField     DataField   = 名称    HeaderText   = 名称    SortExpression   = 名称    /  >  
 <   asp：BoundField     DataField   = < span class =code-keyword>价格    HeaderText   = 价格     SortExpression   = < span class =code-keyword>价格    /  >  
 <   asp：BoundField     DataField   =  ImageUrl    HeaderText   =  ImageUrl  
   
                                           SortExpression   =  ImageUrl    /  >  
 <   asp：BoundField     DataField   =  详细信息    HeaderText   = 详细信息  
   
                                        < span class =code-attribute>   SortExpression   = 详细信息    /  > ;  
 <   asp：BoundField     DataField   =  ProductCode    HeaderText   =  ProductCode  
   
                                           SortExpression   =  ProductCode    /  >  
 <   asp：BoundField     DataField   =  项目    HeaderText   = 项目    SortExpression   = 项目    /  >  
 <   asp：BoundField     DataField   =  CategoryId    HeaderText   =  CategoryId  
   
                      < span class =code-attribute>                     SortExpression   = 类别Id    /  >  
 <   /列 >  
 <   / asp：GridView  >  
 <   asp：按钮    ID   =  Button1     runat   =  server    onclick   =  Button1_Click  
   
            < span class =code-attribute>              文本  = 插入    /  >  
 <   asp：ObjectDataSource     ID   =  ObjectDataSourc e2    runat   =  server  
   
                           DataObjectTypeName   =  BusinessObject.Products    DeleteMethod  < span class =code-keyword> = 删除  
   
                           SelectMethod   =  GetAllProductByCategory    TypeName   =  BusinessLogic.ProductsBL >  
 <   SelectParameters  < span class =code-keyword>>  
 <   asp：ControlParameter     ControlID   =  DropDownList1   名称  =  categoryId  
   
                                           PropertyName   =  SelectedValue   类型  =  Int32    /  >  
 <   / SelectParameters  >  
 <   / asp：ObjectDataSource  >  
 
 <   asp：DetailsView     ID   =  DetailsView1     runat   = < span class =code-keyword> server   高度  =  50px   宽度  =  125px  
   
                           AutoGenerateRows   =  False    DataSourceID   =  ObjectDataSource3  
   
                           oniteminserted   =  DetailsView1_ItemInserted  
   
                           oniteminserting   =  DetailsView1_ItemInserting  
   
  < span class =code-attribute>                         onitemupdated   =  DetailsView1_ItemUpdated  
   
                           onitemupdating   =  DetailsView1_ItemUpdating >  
 <  字段 >  
 <   asp：BoundField     DataField   =  Id    HeaderText   =  Id    SortExpression   =  Id    /   >  
 <   asp：BoundField     DataField   = 名称     HeaderText   = < span class =code-keyword>名称    SortExpression   = 名称    /  >  
 <   asp：BoundField     DataField   = 价格    HeaderText   = 价格    SortExpression   = 价格    /  >  
 <   asp：BoundField     DataField   =  ImageUrl    HeaderText   =  ImageUrl  
   
            < span class =code-attribute>                               SortExpression   =  ImageUrl    /  >  
 <   asp：BoundField     DataField   = < span class =code-keyword>详细信息    HeaderText   = 详细信息  
   
                                           SortExpression   = 详细信息    /  >  
 <   asp：BoundField   DataField=\"ProductCode\" HeaderText=\"ProductCode\" 
  
                     SortExpression=\"ProductCode\" /> 
                 <asp:BoundField DataField=\"Item\" HeaderText=\"Item\" SortExpression=\"Item\" /> 
                 <asp:BoundField DataField=\"CategoryId\" HeaderText=\"CategoryId\" 
  
                     SortExpression=\"CategoryId\" /> 
                 <asp:CommandField ShowEditButton=\"True\" ShowInsertButton=\"True\" /> 
             </Fields> 
         </asp:DetailsView> 
         <asp:ObjectDataSource ID=\"ObjectDataSource3\" runat=\"server\" 
  
             DataObjectTypeName=\"BusinessObject.Products\" InsertMethod=\"Insert\" 
  
             SelectMethod=\"GetDe tail\" TypeName=\"BusinessLogic.ProductsBL\" 
  
             UpdateMethod=\"Update\"> 
             <SelectParameters> 
                 <asp:ControlParameter ControlID=\"GridView1\" Name=\"Id\" 
  
                     PropertyName=\"SelectedValue\" Type=\"Int32\" /> 
             </SelectParameters> 
         </asp:ObjectDataSource> 
     </div> 
     </form> 
 </body> 
 </html>

 
 
 
 
 
 
 
 The aspx.cs file here’s below:
 
 
 
 
public partial class Admin_ManageProducts : System.Web.UI.Page 
 { 
     protected void Page_Load(object sender, EventArgs e) 
     { 
  
     } 
     protected void Button1_Click(object sender, EventArgs e) 
     { 
         DetailsView1.ChangeMode(DetailsViewMode.Insert); 
     } 
  
     protected void DetailsView1_ItemInserted(object sender, DetailsViewInsertedEventArgs e) 
     { 
         GridView1.DataBind(); 
     } 
     protected void DetailsView1_ItemUpdated(object sender, DetailsViewUpdatedEventArgs e) 
     { 
         GridView1.DataBind(); 
     } 
     protected void DetailsView1_ItemInserting(object sender, DetailsViewInsertEventArgs e) 
     { 
         FileUpload fuImage = (FileUpload)DetailsView1.FindControl(\"FileUpload4\"); 
  
         if (fuImage.HasFile) 
         { 
             string relativePath = \"~/Uploads\"; 
             string absolutePath = Server.MapPath(relativePath); 
             string fileName = fuImage.FileName; 
             string fullFilePath = string.Format(\"{0}/{1}\",absolutePath,relativePath); 
             fuImage.SaveAs(fullFilePath); 
             e.Values.Add(\"ImageUrl\", \"~/Uploads\"+fileName); 
         } 
     } 
  
     protected void DetailsView1_ItemUpdating(object sender, DetailsViewUpdateEventArgs e) 
     { 
         FileUpload fuImage = (FileUpload)DetailsView1.FindControl(\"FileUpload6\"); 
         if (fuImage.HasFile) 
         { 
             string relativePath = \"~/Uploads\"; 
             string absolutePath = Server.MapPath(relativePath); 
             string fileName = fuImage.FileName; 
             string fullFilePath = string.Format(\"{0}/{1}\",absolutePath,relativePath); 
             fuImage.SaveAs(fullFilePath); 
             e.NewValues.Add(\"ImageUrl\", \"~/Uploads\"+fileName); 
  
         } 
     }

 
 
 
 Please help me
 解决方案 
Actually, it’s fairly obvious:
 
 
string relativePath = \"~/Uploads\"; 
 string absolutePath = Server.MapPath(relativePath); 
 string fileName = fuImage.FileName; 
 string fullFilePath = string.Format(\"{0}/{1}\",absolutePath,relativePath); 
 fuImage.SaveAs(fullFilePath);

 
 
 
 Why?
 
 Assume your website root folder is \"C:\Websites\Gharuboy\".
 
 So 
 
 
relativePath = \"~/Uploads\" 
 absolutePath = \"C:\Websites\Gharuboy\Uploads\" 
 fullFilePath = \"C:\Websites\Gharuboy\Uploads/~/Uploads\"
And
fuImage.SaveAs(fullFilePath); 
 
Will try to save as that file...
 
 No. I think what you want is this:
 
 
string fullFilePath = string.Format(\"{0}/{1}\",absolutePath,fileName); 
 
 
 
 
Hello everybody, I face a new problem in my first asp.net web application in Visual Studio 2008 and the error is that "
System.FormatException: Input string was not in a correct format.
".I searching on internet about this error but still I didn't got any specific solution.So please help me to figure out this error.Here's below is the code of Admin/ManageProducts.aspx and Admin/ManageProducts.aspx.cs files respectively :



</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True"

            DataSourceID="ObjectDataSource1">
        </asp:DropDownList>
        <asp:ObjectDataSource ID="ObjectDataSource1" runat="server"

            SelectMethod="GetAll" TypeName="BusinessLogic.CategoriesBL"></asp:ObjectDataSource>


        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"

            DataSourceID="ObjectDataSource2" DataKeyNames="Id">
            <Columns>
                <asp:CommandField ShowDeleteButton="True" ShowSelectButton="True" />
                <asp:BoundField DataField="Id" HeaderText="Id" SortExpression="Id" />
                <asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" />
                <asp:BoundField DataField="Price" HeaderText="Price" SortExpression="Price" />
                <asp:BoundField DataField="ImageUrl" HeaderText="ImageUrl"

                    SortExpression="ImageUrl" />
                <asp:BoundField DataField="Detail" HeaderText="Detail"

                    SortExpression="Detail" />
                <asp:BoundField DataField="ProductCode" HeaderText="ProductCode"

                    SortExpression="ProductCode" />
                <asp:BoundField DataField="Item" HeaderText="Item" SortExpression="Item" />
                <asp:BoundField DataField="CategoryId" HeaderText="CategoryId"

                    SortExpression="CategoryId" />
            </Columns>
        </asp:GridView>
        <asp:Button ID="Button1" runat="server" onclick="Button1_Click"

            Text="Insert " />
        <asp:ObjectDataSource ID="ObjectDataSource2" runat="server"

            DataObjectTypeName="BusinessObject.Products" DeleteMethod="Delete"

            SelectMethod="GetAllProductByCategory" TypeName="BusinessLogic.ProductsBL">
            <SelectParameters>
                <asp:ControlParameter ControlID="DropDownList1" Name="categoryId"

                    PropertyName="SelectedValue" Type="Int32" />
            </SelectParameters>
        </asp:ObjectDataSource>

        <asp:DetailsView ID="DetailsView1" runat="server" Height="50px" Width="125px"

            AutoGenerateRows="False" DataSourceID="ObjectDataSource3"

            oniteminserted="DetailsView1_ItemInserted"

            oniteminserting="DetailsView1_ItemInserting"

            onitemupdated="DetailsView1_ItemUpdated"

            onitemupdating="DetailsView1_ItemUpdating">
            <Fields>
                <asp:BoundField DataField="Id" HeaderText="Id" SortExpression="Id" />
                <asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" />
                <asp:BoundField DataField="Price" HeaderText="Price" SortExpression="Price" />
                <asp:BoundField DataField="ImageUrl" HeaderText="ImageUrl"

                    SortExpression="ImageUrl" />
                <asp:BoundField DataField="Detail" HeaderText="Detail"

                    SortExpression="Detail" />
                <asp:BoundField DataField="ProductCode" HeaderText="ProductCode"

                    SortExpression="ProductCode" />
                <asp:BoundField DataField="Item" HeaderText="Item" SortExpression="Item" />
                <asp:BoundField DataField="CategoryId" HeaderText="CategoryId"

                    SortExpression="CategoryId" />
                <asp:CommandField ShowEditButton="True" ShowInsertButton="True" />
            </Fields>
        </asp:DetailsView>
        <asp:ObjectDataSource ID="ObjectDataSource3" runat="server"

            DataObjectTypeName="BusinessObject.Products" InsertMethod="Insert"

            SelectMethod="GetDetail" TypeName="BusinessLogic.ProductsBL"

            UpdateMethod="Update">
            <SelectParameters>
                <asp:ControlParameter ControlID="GridView1" Name="Id"

                    PropertyName="SelectedValue" Type="Int32" />
            </SelectParameters>
        </asp:ObjectDataSource>
    </div>
    </form>
</body>
</html>








The aspx.cs file here's below:



public partial class Admin_ManageProducts : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        DetailsView1.ChangeMode(DetailsViewMode.Insert);
    }

    protected void DetailsView1_ItemInserted(object sender, DetailsViewInsertedEventArgs e)
    {
        GridView1.DataBind();
    }
    protected void DetailsView1_ItemUpdated(object sender, DetailsViewUpdatedEventArgs e)
    {
        GridView1.DataBind();
    }
    protected void DetailsView1_ItemInserting(object sender, DetailsViewInsertEventArgs e)
    {
        FileUpload fuImage = (FileUpload)DetailsView1.FindControl("FileUpload4");

        if (fuImage.HasFile)
        {
            string relativePath = "~/Uploads";
            string absolutePath = Server.MapPath(relativePath);
            string fileName = fuImage.FileName;
            string fullFilePath = string.Format("{0}/{1}",absolutePath,relativePath);
            fuImage.SaveAs(fullFilePath);
            e.Values.Add("ImageUrl", "~/Uploads"+fileName);
        }
    }

    protected void DetailsView1_ItemUpdating(object sender, DetailsViewUpdateEventArgs e)
    {
        FileUpload fuImage = (FileUpload)DetailsView1.FindControl("FileUpload6");
        if (fuImage.HasFile)
        {
            string relativePath = "~/Uploads";
            string absolutePath = Server.MapPath(relativePath);
            string fileName = fuImage.FileName;
            string fullFilePath = string.Format("{0}/{1}",absolutePath,relativePath);
            fuImage.SaveAs(fullFilePath);
            e.NewValues.Add("ImageUrl", "~/Uploads"+fileName);

        }
    }




Please help me
解决方案
Actually, it's fairly obvious:

string relativePath = "~/Uploads";
string absolutePath = Server.MapPath(relativePath);
string fileName = fuImage.FileName;
string fullFilePath = string.Format("{0}/{1}",absolutePath,relativePath);
fuImage.SaveAs(fullFilePath);




Why?

Assume your website root folder is "C:\Websites\Gharuboy".

So 

relativePath = "~/Uploads"
absolutePath = "C:\Websites\Gharuboy\Uploads"
fullFilePath = "C:\Websites\Gharuboy\Uploads/~/Uploads"
And
fuImage.SaveAs(fullFilePath);
Will try to save as that file...

No. I think what you want is this:

string fullFilePath = string.Format("{0}/{1}",absolutePath,fileName);


                        
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