## Fallback(char, int) {#fallback_1}

当遇到输出代码页外的单字符字符时调用

```csharp
public override bool Fallback(char charUnknown, int index)
```

| 范围 | 类型 | 描述 |
| --- | --- | --- |
| charUnknown | Char | 超出代码页字符 |
| 索引 | Int32 | 输入字符串中的字符索引 |

### 返回值

True if我们确实替换，如果不是则为 false

### 也可以看看

* class [CifReplacingEncoderFallbackBuffer](../../cifreplacingencoderfallbackbuffer)
* 命名空间 [Aspose.CAD](../../cifreplacingencoderfallbackbuffer)
* 部件 [Aspose.CAD](../../../)

---

## Fallback(char, char, int) {#fallback}

当遇到输出代码页外的代理对时调用

```csharp
public override bool Fallback(char charUnknownHigh, char charUnknownLow, int index)
```

| 范围 | 类型 | 描述 |
| --- | --- | --- |
| charUnknownHigh | Char | 超出代码页字符 - 高代理 |
| charUnknownLow | Char | 超出代码页字符 - 低代理 |
| 索引 | Int32 | 输入字符串中的字符索引 |

### 返回值

如果我们替换则为真，否则为假

### 也可以看看

* class [CifReplacingEncoderFallbackBuffer](../../cifreplacingencoderfallbackbuffer)
* 命名空间 [Aspose.CAD](../../cifreplacingencoderfallbackbuffer)
* 部件 [Aspose.CAD](../../../)

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