Question

我想用二进制图像列创建网格视图。源是来自数据库的图像路径。但图像并没有出现。

<dx:GridViewDataBinaryImageColumn Caption="Image" FieldName="Image_Path"
                    VisibleIndex="7" Width="20%">
                    <PropertiesBinaryImage ImageHeight="150" ImageWidth="225" EnableServerResize="True" ImageUrlFormatString="Image_Path">
                    <EditingSettings Enabled="true" UploadSettings-UploadValidationSettings-MaxFileSize="4194304"/>
                    </PropertiesBinaryImage>
                    <SettingsHeaderFilter>
                        <DateRangePickerSettings EditFormatString="" />
                    </SettingsHeaderFilter>
                    <HeaderStyle HorizontalAlign="Center" />
                    <CellStyle HorizontalAlign="Center">
                    </CellStyle>
                </dx:GridViewDataBinaryImageColumn>

我的asp代码有什么问题吗？感谢

Answer 1

GridViewDataBinaryImageColumn documentation评论部分说：

ASPxGridView不会自动生成二进制图像列（前提是ASPxGridView.AutoGenerateColumns选项是启用）即可。您应该手动创建二进制映像列并绑定它到包含二进制格式图像的数据字段。

您可以通过在GridViewDataBinaryImageColumn标记中设置AutoGeneratedColumns="False"来手动创建GridView：

<dx:ASPxGridView ID="GridView1" runat="server" AutoGeneratedColumns="False" ...>
    <%-- other settings --%>

    <Columns>
        <%-- other column settings --%>

        <dx:GridViewDataBinaryImageColumn Caption="Image" FieldName="Image_Path"
                VisibleIndex="7" Width="20%">

            <%-- binary image column settings --%>

        </dx:GridViewDataBinaryImageColumn>
        <%-- other column settings --%>

    </Columns>

    <%-- other settings --%>
</dx:ASPxGridView>

如果您想将DataBound设置为true，请使用AutoGeneratedColumns事件后面的代码手动创建它：

protected void GridView1_DataBound(object sender, EventArgs e) 
{
    ASPxGridView grid = sender as ASPxGridView;

    // check if row "Image_Path" exists
    if (grid.Columns.IndexOf(grid.Columns["Image_Path"]) != -1)
        return;

    var column = new GridViewDataBinaryImageColumn();
    column.FieldName = "Image_Path";
    column.Caption = "Image";

    // other binary image column settings

    grid.Columns.Add(column);
}

GridViewDataBinaryImageColumn无法显示图像

1 个答案: