使用C#替换Word文档里的文字和图片

基本思路

替换文字：使用Microsoft.Office.Interop.Word接口中的Find属性：

Object missing = Missing.Value;
object replaceAll = WdReplace.wdReplaceAll;

_application.Selection.Find.ClearFormatting();
_application.Selection.Find.Text = origialString;

_application.Selection.Find.Replacement.ClearFormatting();
_application.Selection.Find.Replacement.Text = destinationString;

_application.Selection.Find.Execute(
ref missing, ref missing, ref missing, ref missing, ref missing,
ref missing, ref missing, ref missing, ref missing, ref missing,
ref replaceAll, ref missing, ref missing, ref missing, ref missing);

其中，_application是Microsoft.Office.Interop.Word.Application类型的变量，_application.Selection.Find.Text = origialString; 用来指定要被替换的文字，_application.Selection.Find.Replacement.Text = destinationString;用来指定替换后的文字。在实践过程中，发现了两个问题需要解决；问题1,当替换后的文字长度超过255个时，该方法执行时会出现异常；问题2：无法替换文本框中的字符，为此，将方法修改如下：

//用模板字符替换原字符
private void ReplaceString(string origialString, string destinationString)
{
#region 如果目标字符串长度大于255，则分成小于255的若干多分别进行替换
/*
* 例如：destinationString的长度是300；
* 第一步：将origialString替换为“$$$1$”和“$$$2$”;
* 第二步：将destinationString分解为两个字符串，第一个字符串长度255，第二个字符串长度300-255=45；
* 第三步：用第一个字符串替换“$$$1$”，用第二个字符串替换“$$$2$”
*/
if (destinationString.Length > 255)
{
int count = destinationString.Length / 255 + ((destinationString.Length % 255) == 0 ? 0 : 1);
List<string> origianlStringList = new List<string>();
List<string> destinationStringList = new List<string>();
for (int i = 0; i < count; i++)
{
origianlStringList.Add("$$$" + i.ToString() + "$");

int length;//每小段的长度
if (i != count - 1)
{
length = 255;
}
else
{
length = destinationString.Length % 255;
}
destinationStringList.Add(destinationString.Substring(i * 255, length));
}
string origianlStringListTotalString = string.Empty;
for (int i = 0; i < count; i++)
{
origianlStringListTotalString += origianlStringList[i];
}
this.ReplaceString(origialString, origianlStringListTotalString);
for (int i = 0; i < count; i++)
{
this.ReplaceString(origianlStringList[i], destinationStringList[i]);
}
return;
}

#endregion

Object missing = Missing.Value;
object replaceAll = WdReplace.wdReplaceAll;

_application.Selection.Find.ClearFormatting();
_application.Selection.Find.Text = origialString;

_application.Selection.Find.Replacement.ClearFormatting();
_application.Selection.Find.Replacement.Text = destinationString;

_application.Selection.Find.Execute(
ref missing, ref missing, ref missing, ref missing, ref missing,
ref missing, ref missing, ref missing, ref missing, ref missing,
ref replaceAll, ref missing, ref missing, ref missing, ref missing);
//
//替换在文本框中的文字
//
StoryRanges ranges = _application.ActiveDocument.StoryRanges;
foreach (Range item in ranges)
{
if (WdStoryType.wdTextFrameStory == item.StoryType)
{
Range range = item;
while (range != null)
{
range.Find.ClearFormatting();
range.Find.Text = origialString;
range.Find.Replacement.Text = destinationString;
range.Find.Execute(
ref missing, ref missing, ref missing, ref missing, ref missing,
ref missing, ref missing, ref missing, ref missing, ref missing,
ref replaceAll, ref missing, ref missing, ref missing, ref missing);
range = range.NextStoryRange;
}
break;
}
}
}
}

替换图片：在要被替换的图片前加入书签，替换时遍历书签，并读取书签后面的图片，将给定图片设置为和原始图片一样大小，并放在书签后面替换原有图片：

/// <summary>

/// 要设置图片的名称（路径+图片名称）

/// </summary>

/// <param name="index">书签名称</param>

/// <returns>图片路径</returns>

public string this[string index]

{

set

{

if (File.Exists(value))

{

foreach (Bookmark item in _application.ActiveDocument.Bookmarks)

{

if (item.Name == index)

{

item.End += 1;

item.Select();

object missing = Missing.Value;

if (_application.Selection.InlineShapes.Count > 0)

{

float width = _application.Selection.InlineShapes[0].Width;

float height = _application.Selection.InlineShapes[0].Height;

try

{

InlineShape shape = _application.Selection.InlineShapes.AddPicture(value, ref missing, ref missing, ref missing);

shape.Width = width;

shape.Height = height;

}

catch (Exception)

{

throw new Exception("无法插入图片！");

}

}

}

}

}

}

}

其中，索引Index为书签名，索引值为新图片的路径