Question

我最近将iText7项目从7.0.1升级到7.0.2。之后，我尝试重建我的项目并进行单元测试。单元测试给了我一个错误，然后我尝试调试单元测试。结果是我之前从未发现过一个奇怪的异常......代码是相同的，但它在v7.0.1上运行顺利，但是在v7.0.2上遇到了异常：

异常消息：

“Nullable对象必须有值。”

异常StackTrace：

在System.ThrowHelper.ThrowInvalidOperationException（ExceptionResource   资源）在iText.Layout.Renderer.TableRenderer.Layout（LayoutContext）   layoutContext）at   iText.Layout.Renderer.RootRenderer.AddChild（IRenderer渲染器）at   iText.Layout.RootElement`1.Add（IBlockElement元素）at   iText.Layout.Document.Add（IBlockElement元素）at   C：\ Users \ Jeffry中的KMK_Core.Core._Core_PrintKMK（）   Angtoni \ Source \ Repos \ kmk-core-ng \ KMK NG \ KMK Core \ Core.cs：第332行

下面是我的表生成器代码：

Table tblStudentIdentity = new Table(new float[] { 3.5f, .2f, 5f });
tblStudentIdentity.SetWidthPercent(80f);

_Core_SetIdentityTableValue(ref tblStudentIdentity, "NAMA", "Name", "LEONARDO DICAPRIO");
_Core_SetIdentityTableValue(ref tblStudentIdentity, "NIM", "Student Number", "1301566255");
_Core_SetIdentityTableValue(ref tblStudentIdentity, "FAKULTAS / SEKOLAH", "Faculty/School", "", "School of Computer Science");

tblStudentIdentity.SetRelativePosition(115f, 20f, 0f, 0f);
_doc.Add(tblStudentIdentity);

下面是我的_Core_SetIdentityTableValue函数：

private int _Core_SetIdentityTableValue(ref Table tableObject, string LeftLabelID = "", string LeftLabelEN = "", string RightValueID = "", string RightValueEN = "")
{
    int Result = 0;
    Text txtOpenInfo = new Text("(").AddStyle(StyleHelper.lblIDStyle);
    Text txtCloseInfo = new Text(")").AddStyle(StyleHelper.lblIDStyle);
    Text txtColonInfo = new Text(":").AddStyle(StyleHelper.lblIDStyle);

    Paragraph lblLeftPrgrh = new Paragraph();
    if (LeftLabelEN != "" && LeftLabelID != "")
    {
        Text lblID = new Text(LeftLabelID + " ").AddStyle(StyleHelper.lblIDStyle);
        Text lblEN = new Text(LeftLabelEN).AddStyle(StyleHelper.lblENStyle);
        lblLeftPrgrh.Add(lblID).Add(txtOpenInfo).Add(lblEN).Add(txtCloseInfo);
    }else if (LeftLabelEN == "" && LeftLabelID != "")
    {
        Text lblID = new Text(LeftLabelID).AddStyle(StyleHelper.lblIDStyle);
        lblLeftPrgrh.Add(lblID);
    }else if (LeftLabelEN != "" && LeftLabelID == "")
    {
        Text lblEN = new Text(LeftLabelEN).AddStyle(StyleHelper.lblENStyle);
        lblLeftPrgrh.Add(lblEN);
    }else
    {
        Text lblErrorLeft = new Text("Error-NoValue");
        lblLeftPrgrh.Add(lblErrorLeft);
        Result = 1;
    }

    Paragraph lblRightPrgrh = new Paragraph();
    if (RightValueEN != "" && RightValueID != "")
    {
        Text lblValID = new Text(RightValueID + " ").AddStyle(StyleHelper.lblIDStyle);
        Text lblValEN = new Text(RightValueEN).AddStyle(StyleHelper.lblENStyle);
        lblRightPrgrh.Add(lblValID).Add(txtOpenInfo).Add(lblValEN).Add(txtCloseInfo);
    }else if (RightValueEN == "" && RightValueID != "")
    {
        Text lblValID = new Text(RightValueID).AddStyle(StyleHelper.lblIDStyle);
        lblRightPrgrh.Add(lblValID);
    }else if (RightValueEN != "" && RightValueID == "")
    {
        Text lblValEN = new Text(RightValueEN).AddStyle(StyleHelper.lblENStyle);
        lblRightPrgrh.Add(lblValEN);
    }else
    {
        Text lblValError = new Text("Error-NoValue");
        lblRightPrgrh.Add(lblValError);
        Result = 1;
    }

    Paragraph lblCenterPrgrh = new Paragraph(txtColonInfo);

    Cell cellLeft = new Cell();
    cellLeft.Add(lblLeftPrgrh)
        .SetBorder(Border.NO_BORDER)
        .SetVerticalAlignment(VerticalAlignment.TOP);
    Cell cellMiddle = new Cell();
    cellMiddle.Add(lblCenterPrgrh)
        .SetBorder(Border.NO_BORDER)
        .SetVerticalAlignment(VerticalAlignment.TOP);
    Cell cellRight = new Cell();
    cellRight.Add(lblRightPrgrh)
        .SetBorder(Border.NO_BORDER)
        .SetVerticalAlignment(VerticalAlignment.TOP);
    tableObject.AddCell(cellLeft).AddCell(cellMiddle).AddCell(cellRight);
    return Result;
}

这是v7.0.2中的错误，因为v7.0.1成功运行上面的代码......？我还检查了Table对象不是null，但异常告诉该对象可能为null ...这个修复的任何线索或解决方案......？

Answer 1

不幸的是，这确实是7.0.2中的一个错误，它与表的相对定位的错误处理有关，并且存在于Java和C＃中。它已经修复，但修复程序仅在7.0.3版本中可用。但是，您始终可以从Artifactory下载快照版本（在C＃中也称为7.0.2.1）。

文档无法在iText 7.0.2上添加Table对象

1 个答案: