从 PDF 中删除表单 C#

基于子类型/表单删除文本

下一个代码片段使用包含 PDF 文件路径的输入变量创建一个新的 Document 对象。该示例访问文档第 2 页上呈现的表单，并检查具有某些属性的表单。如果找到类型为“打字机”和子类型为“表单”的表单，则使用 TextFragmentAbsorber 访问并删除该表单中的所有文本片段。

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void ClearTextInForm(string input, string output)
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_Forms();

    // Open PDF document
    using (var document = new Aspose.Pdf.Document(dataDir + "TextBox.pdf"))
    {
        // Get the forms from the first page
        var forms = document.Pages[1].Resources.Forms;

        foreach (var form in forms)
        {
            // Check if the form is of type "Typewriter" and subtype "Form"
            if (form.IT == "Typewriter" && form.Subtype == "Form")
            {
                // Create a TextFragmentAbsorber to find text fragments
                var absorber = new Aspose.Pdf.Text.TextFragmentAbsorber();
                absorber.Visit(form);

                // Clear the text in each fragment
                foreach (var fragment in absorber.TextFragments)
                {
                    fragment.Text = "";
                }
            }
        }

        // Save PDF document
        document.Save(dataDir + "TextBox_out.pdf");
    }	
}

从 PDF 中删除类型为“打字机”和子类型为“表单”的表单

此代码片段在 PDF 文档的第一页上搜索意图（IT）为“打字机”和子类型（Subtype）为“表单”的表单。如果满足这两个条件，则从 PDF 中删除该表单。然后将修改后的文档保存到指定的输出文件。

Aspose.PDF 库提供两种方法来从 PDF 中删除此类表单：

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void DeleteSpecifiedForm(string input, string output)
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_Forms();
	
    // Open PDF document
    using (var document = new Aspose.Pdf.Document(dataDir + "TextField.pdf"))
    {
        // Get the forms from the first page
        var forms = document.Pages[1].Resources.Forms;

        // Iterate through the forms and delete the ones with type "Typewriter" and subtype "Form"
        for (int i = forms.Count; i > 0; i--)
        {
            if (forms[i].IT == "Typewriter" && forms[i].Subtype == "Form")
            {
                forms.Delete(forms[i].Name);
            }
        }

        // Save PDF document
        document.Save(dataDir + "TextBox_out.pdf");
    }
}

方法 2：

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void DeleteSpecifiedForm(string input, string output)
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_Forms();

    // Open PDF document
    using (var document = new Aspose.Pdf.Document(dataDir + "TextField.pdf"))
    {
        // Get the forms from the first page
        var forms = document.Pages[1].Resources.Forms;

        // Iterate through the forms and delete the ones with type "Typewriter" and subtype "Form"
        foreach (var form in forms)
        {
            if (form.IT == "Typewriter" && form.Subtype == "Form")
            {
                var name = forms.GetFormName(form);
                forms.Delete(name);
            }
        }

        // Save PDF document
        document.Save(dataDir + "TextBox_out.pdf");
    }
}

从 PDF 中删除所有表单

此代码从 PDF 文档的第一页删除所有表单元素，然后将修改后的文档保存到指定的输出路径。

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void RemoveAllForms(string input, string output)
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_Forms();

    // Open PDF document
    using (var document = new Aspose.Pdf.Document(dataDir + "TextField.pdf"))
    {
        // Get the forms from the first page
        var forms = document.Pages[1].Resources.Forms;

        // Clear all forms
        forms.Clear();

        // Save PDF document
        document.Save(dataDir + "TextBox_out.pdf");
    }
}